YouTube: Rick Santorum 'took one for the team' and voted against his principles during his near two decade career in Washington. He did so for political reasons and abandoned principle.

"It just feels good being back in Michigan. The trees are the right height. The streets are just right. I like the fact that most of the cars I see are Detroit-made automobiles. I drive a Mustang and a Chevy pickup truck. Ann drives a couple of Cadillacs actually," Mitt Romney

"That was embarrassing what we saw," Charles Krauthammer said about the Obama administration issuing multiple apologies to the Muslim world for the Koran-burning incident. "We have gone from apology here to abject self-debasement and groveling. And groveling to whom? To the mob. We should've had a single apology from the commander on the ground

Santorum: “Mitt Romney, for an outsider, he’s got every insider in the country running his campaign, who is trying to protect the special interests in this country.”

"That’s the kind of balance you need," said Geithner. "Why is that the case? Because if you don't try to generate more revenues through tax reform, if you don't ask, you know, the most fortunate Americans to bear a slightly larger burden of the privilege of being an American, then you have to -- the only way to achieve fiscal sustainability is th

JUAN WILLIAMS: Pat, in your case, the charge is one that is so powerful in the American mind, given our history. The charge is "Pat Buchanan is a racist". So let me ask you. Are you a racist, Pat? PAT BUCHANAN: What does racism mean? Do I hate black folks? That's what racism means. "I hate black folks" "I want them discriminated against" Y

Daily Show: At the Arizona GOP debate, Rick Santorum explains the decision-making process behind his conservative transgressions, and Mitt Romney describes himself as resolute. (07:40)

Comedian and HBO host Bill Maher donates a supersized check to Priorities USA, the Super PAC that is backing President Obama.

"I made no promise about supporting anybody. I wouldn't do it. It would be wrong to make a promise in advance of knowing who the nominee was and what the qualifications were," Fmr. Senator Arlen Specter (D-PA) said about Rick Santorum supporting him when he was a Republican. "There was never any discussion at all between Senator Santorum and me

Lawrence O'Donnell, Joe Klein and E.J. Dionne discuss the Latino demographic in the GOP race.

The panel reviews Wednesday night's GOP presidential debate in Arizona.

Chris Matthews, Susan Page and Howard Fineman review the GOP debate.

Bill O'Reilly says that Rick Santorum, Mitt Romney and Newt Gingrich largely share the same world view and policy positions.