I realize that you simply copied the article's premise, but it, and you, are wrong. The bill requires teaching the significance of Obama's election: the first black man to hold that office in a country of former slave owners. It says nothing about how well he performed the job, it's solely about his being elected. Period. That is a historic first, and would be taught as such in any case, making the bill/law unnecessary - but it harms nothing & no one.
Texas, on the other hand, has revised their school books to be more "conservative and Christian friendly", as of 2010. One of the consultants in this highly partisan effort to brainwash students is David Barton, whose version of history differs from the commonly accepted one,and has been discredited repeatedly. [His book about Thomas Jefferson, for example, was withdrawn by the publishers for "numerous factual errors".] He insists that the Founding Fathers settled the 'creationism vs evolution debate', too. Which is a pretty neat trick, considering Darwin hadn't even been born when the FFs lived.
California insists on teaching the obvious: the election of a black man as POTUS was historic. Yawn.
Texas is deliberately distorting history to teach conservative 'Christian' ideology as fact in textbooks.
I know which seems more blatantly wrong to me.