Obama administration believes Iran “is a rational actor” and that talks could prevent a nuclear bomb. Israel disagrees. NBC’S Andrea Mitchell reports.

Is, I thought we were talking about the economy. And Paul Ryan wants to talk more about the economy, but the reality is, in the Republican race, social issues seem to be energizing the base and fueling Rick Santorum. ANDREA MITCHELL: And the question...

TAPPER: And one of the -- one of the things that goes on in campaigns, of course, is you have supporters, you have surrogates, and sometimes they go a little bit off message. Rick Santorum has a support named Foster Friess. He went on Andrea Mitchell's...

The "Lean Forward" ads, which have a distinct style, feature network hosts pontificating about political issues of the day while seemingly in mid-conversation with Lee. Hosts including Rachel Maddow, Chris Matthews, Andrea Mitchell, Al Sharpton, Ed...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

REP. PAUL RYAN (R-WI): Well, I couldn't hear all of that clip from Rick Santorum, but what I would say is what we're getting from the White House with this conscience issue, it's not an issue about contraception, it's an issue that reveals a political...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Bloomberg News Executive Editor Al Hunt added, however, that a big Super Tuesday win for Mitt Romney would give him "big mo'" that will propel him forward toward that goal. Besides, "there's no natural savior," Hunt said, as the panel ticked off names...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...

Political Roundtable Mitt Romney and Rick Santorum are bracing for a battle in Michigan, the state where Romney, the “favorite son,” finds himself neck and neck with a surging Santorum who hopes to make a big statement in the Wolverine State. If...