Chris Matthews: Is challenging Obama unconstitutional?

[Chris Matthews:] “I don't think [Romney] understands the Constitution of the United States. He’s the president of the United States. You don't say, 'You’ll get your chance.'" … just for the record, there is nothing in the Constitution barring one from saying “You’ll get your chance” to the President of the United States — no matter what his supporters on MSNBC say.