Nayana Davis

This post was updated at 6:15 p.m. ET

Florida Republican Sen. Marco Rubio, who announced his bid for president Monday, was elected in 2010 as a Tea Party favorite. He's now trying to position himself as someone who represents a broad cross section of the Republican Party.

Kentucky Sen. Rand Paul announced his bid for the White House Tuesday on his website. The 52-year-old former ophthalmologist's libertarian roots sets him apart from the expansive field of Republican hopefuls, most notably in foreign policy and issues like defense spending.

His father Ron Paul, also a physician, ...

Just after midnight Monday, Texas Sen. Ted Cruz scooped his own big announcement by about 10 hours. Ahead of a planned speech, he posted the news of his presidential bid on Twitter.

"I'm running for President and I hope to earn your support!" he tweeted.

The tweet, which included a ...

Two days after the State of the Union address, President Obama will sit down for a round of unusual interviews. There's a good chance he'll get a question that none of his predecessors have ever had to answer.

One distinct possibility: "Mr. President, is you OK? Is you good? 'Cuz ...