Perjury smergury. They don't have the stomach to bother with that.
It doesn't matter whether they have the stomach or not. They have her red-handed on the email mess, and Comey pretty much stated that. They can also produce slam-dunk evidence of lying under oath. However, they will still have to turn to the Obama DOJ to prosecute her and it's obvious that ain't gonna happen. The best they can do is continue the attempt to try Hillary in the court of public opinion, and the Mainstream Media will be her lead defense counsel.
With this being yet another "most critical presidential election ever" the GOP has no choice but to continue the campaign of exposure for these and the many other skeletons Hillary and her sleazy husband carry in their sizeable baggage. Considering Trump's unfavorables he will definitely be swimming upstream but he has a lot of things going in his favor, most notably his anti-establishment appeal. Obama got elected - and re-elected in spite of his awful first term record - because he was black and was facing weak, cowardly GOP opponents. Being a woman won't work the same for Hillary; she has a really bad political history and it will likely catch up with her in Nov. Remember, most people don't really start paying attention to national politics until after the conventions.