What did Barack Obama do against the constutution?

Answer 1

Nothing. The president supports and has pledged to defend the Constitution. He was also a professor of constitutional law for nearly twelve years, so he understands what is in the Constitution. Beware of political rhetoric on Talk Shows, where they make unproven or untrue accusations about the president just to get ratings. Disagreeing with the policies of any president (whether it was President Bush then or President Obama now) does not prove that the president is "against" the constitution.