Assumptions do get made about about which candidate got what amount of votes, whether through exit polling or party affiliation.
That won't change because of little thing called the First Amendment ... and because it's in the public interest to have the number of ballots cast be transparent.
More transparency of the process, not less, is in the public interest.
Well, it's complicated. Congress could indeed enact legislation that would all but prevent exit polling, and the media knows it. Beeecuz the Supreme Court said so. But the Supreme Court has also written (in other contexts):
"The First Amendment directs us to be especially skeptical of regulations that seek to keep people in the dark for what the government perceives to be their own good." Boom. That's precisely the "more transparency of the process" of which you speak. All things considered, I absolutely agree that if you're gonna err, it's way better to err on the side of transparency, especially when it comes to the government. And exit polling is actually a very important way to verify that elections are being conducted legitimately. It's why the US government actually finances exit polling by NGOs and other monitors in countries all over the world, including former Soviet republics and satellites to ensure votes are counted accurately. But exit polling, and in particular the media projections based on that polling, has an interesting history.
The First Amendment would, of course, generally preclude Congress from prohibiting the media from interviewing voters after they exit the polls. It would likewise also preclude Congress from prohibiting the media from reporting the results of those polls. Congress, could, however, ban voter solicitation within a certain distance from a polling place, and would be able to include exit polling within such a ban (virtually all states have such bans in one form or another, except for the media and the exit polling part). It would also be able to deny media access to ballot counts, either when the polls have not closed in the jurisdiction whose votes are being counted, or when the polls have not closed across the nation.
The media knows this because of Burson v. Freeman, 504 U.S. 191 (1992), where the Supreme Court upheld a Tennessee statute that prohibited the solicitation of votes and the display or distribution of campaign materials within 100 feet of the entrance to a polling place. The Court recognized that this statute both restricted political speech, to which the First Amendment “has its fullest and most urgent application,” and “barred speech in quintessential public forums,” the use of which for assembly and debate “has, from ancient times, been a part of the privileges, immunities, rights, and liberties of citizens.” Further, the statute restricted speech on the basis of its
content, as it restricted political but not commercial solicitation, and therefore was not “a facially content-neutral time, place, or manner restriction.” So, the Court, as is usual in First Amendment cases, applied "strict scrutiny," which usually results in a statute being struck down. Strict scrutiny means, of course, that it requires the state to show that the regulation serves a compelling state interest and is necessary to serve the asserted interest, and must be the least restrictive way to do it.
In the Tennessee case, after applying strict scrutiny, the Court concluded “that a State has a compelling interest in protecting voters from confusion and undue influence,” and “in preserving the integrity of its election process.”
(Incidentally, statues that ban such speech within 300 feet and more have all been struck down by the courts (one big case in 1988 struck down by the 9th Circuit). Apparently 300 feet crosses a line that 100 feet does not. That goes back to the "least restrictive" part of strict scrutiny.)
OK, so knowing all that, knowing that exit polling has not been banned, nor is it likely to be, and knowing that reporting projections based on exit polling is also not banned, nor is it likely to be, but both could very well be if the media abuses it and it results in voter confusion and undue influence, or undermines the integrity of the election process, keep that context in mind.
This all started really with the first major exit poll that was done in 1967 by the legendary polling pioneer Warren Mitofsky when he conducted the first major exit poll for a network during the 1967 Kentucky governor's race. And by the 1970s, exit polling had become an industry practice. Polls were taken and the results were announced, projections were made and then reported.
But then, in 1980 (cue ominous music), NBC reported Ronald Reagan's 1980 victory over Jimmy Carter nearly three hours before polls closed on the West Coast, leading to a large-scale examination of exit polling and Congressional hearings on whether it depressed voter turnout (it did, by a really, really lot). Congress made noises of restrictions, but backed off when they got promises from the media. The networks vowed not to project a state's winners until polls there are closed, and that they would make it unambiguously clear that any projections made based on exit polling were in fact projections and not official results. This was based on comments made by Supreme Court Justices in other rulings and in casual statements where the Court's (almost certain) consensus would have been where voters who hear or read such projections presumably know that they are only projections, and that their votes could still make a difference in the election. And if they decide that that difference is not significant enough to make it worth their while to vote, then they have made a free choice.
In the 1990s,all the major news networks and the Associated Press formed a polling consortium called Voter News Service (VNS) to cut costs and eliminate the redundancy of reports from multiple sources. But then 2000 happened when VNS (and the networks soon afterward) loudly and proudly declared the race for Al Gore around 8 p.m., only to switch to George W. Bush at 2 a.m. and declared the race locked at "too close to call" two hours later. Whoops. Congressional legislation not required. National embarrassment was plenty enough.
A nasty and embarrassing computer glitch in 2002 killed the VNS consortium. It was shut down soon after and replaced by a different set of pollsters, with ironically more redundancy, that serve the new consortium called the National Election Pool. Almost immediately, in 2004, more consortium scandal when exit poll data was leaked online around midday on Election Day, prompting bloggers to declare John Kerry the presumptive winner. Congress was making noises again.
In 2006, the National Election Pool pollsters began quarantining representatives of the NEP to prevent such leaks from occurring. So far so good. NEP members are behaving themselves. Of course, non NEP members can conduct their own polling and report their own projections, but the NEP uses a carefully constructed and somewhat complex methodology to survey voters after the voting, including sampling voters during various periods of the day (certain demographic groups tend to vote at different times) and conducting telephone surveys of those who voted early or by absentee ballots. The NEP members are ABC, CBS, NBC, CNN, Fox News, and the Associated Press. The NEP uses the Associated Press to perform vote tabulations and contracted with Edison Research and Mitofsky International to make the projections and provide the exit poll analysis. Edison and Mitofsky has provided this data since 2004.
To avoid the premature leaking of data, collection is now done in a "Quarantine Room" at an undisclosed location in New York. All of the participants are stripped of outside communications devices until it is time for information to be released officially. Actual projections are made by "decision desks" at the networks, which consist of small groups of journalists and polling experts who use exit data and actual returns to decide when to announce winners. So even though all the networks have access to the same exit poll data, they often don't broadcast projections at the same time, because it can take a while to come up with their own projections.
During the primary season, the networks used exit poll data to slice up the electorate into various demographic groups, giving viewers proof, for example, of one candidate's strength over another among black voters or white college educated women, or one candidate's popularity among white redneck deplorables. These tidbits help fill airtime when networks have exit poll data, but can't release figures on who's winning until polls are closed in a given state. That's what it will be like on Election Day, in between the time the NEP representatives are released from quarantine and a winner emerges. We'll hear about how voters of this group think the country is headed in the right direction and another group think it's headed in the wrong direction. It will be presented as important stuff, too. But it's just tidbit fodder to kill time until the polls close, and for the network's poll nerd to get his screentime spaz on.
Except, there's already been so much early voting, and the various news organizations have commissioned or conducted their own exit polling already (or worse, reported party registration voting as somehow being an important indicator of how they voted), that by the time we get to Election Day half the country will have already voted and they've already broadcast the results of half the exit polling data, which may or may not already be having an effect on voter turnout and in how people will be voting on Election Day, because they will echo the "results of early voter exit polling" long before the polls close, and they'll justify it by saying, "Hey, this was from early voting, which happened ages ago."
It kind of diminishes the whole "Quarantine Room" effect, and the voluntary restriction on holding off releasing figures until the polls are closed in a given state. I mean, we already have headlines like
Nevada early voting ends with big Democratic advantage, thanks in part to strong Latino numbers. You think that won't have an effect on Election Day in Nevada? It will, one way or another. It will either cause Hillary voters to stay home because they think they've already won, which can result in (what will be billed as a) Trump miracle comeback, or Trump voters will resign themselves to a loss and just stay home. Of course, that silly headline isn't even based on exit polling, it's based strictly on the number of registered Democrats and Republicans who voted, and it assumes every registered Democrat voted for Hillary and every Republican voted for Trump. If there was ever an election where party registration means less than normal, it's this one. But people see the headline, read maybe the first four paragraphs, and then move on. (Granted, it's not from a major mainstream media organization, it's from Twitter and Hot Air, so it's largely ingested in the echo chamber, but still. It could very well affect how those in that echo chamber act on Election Day, especially those in Nevada.
As more and more early exit polling gets reported and the Election Day results become less and less relevant, Congress will be closer and closer to making noise again.