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CNN's Jessica Yellin speaks with Nathan Fletcher, San Diego mayoral candidate who quit the GOP to become an independent.

Former Massachusetts Gov. Mitt Romney will win the Republican primaries in Wisconsin, Maryland and the District of Columbia, CNN projects.

Mitt Romney gets pranked, President Obama sees a flaw in his name and Rick Santorum avoids the "Lambeau leap."

GOP candidate Rick Santorum says April looks tough for his campaign, but he foresees big wins in May.

President Barack Obama weighed in Monday on last week's Supreme Court arguments about health care reform, saying he expected the justices to rule the act is constitutional.

GOP candidate Mitt Romney admits that he's "got work to do" to close the gap with women voters in the general election.

The head of the General Services Administration resigned Monday after a scathing report that called government spending on a training seminar in Las Vegas "excessive, wasteful, and in some cases impermissible."

President Obama says several legal experts believe his plan is constitutional.

Ads, phone calls and mailers have bombarded voters in Wisconsin in the days leading up to Tuesday's vote -- the next major battleground in the Republican presidential race.

Even Mitt Romney admits that he's got his work cut out for him to reach out to female voters as he transitions from the GOP presidential nomination race to a likely general election matchup against President Obama.

Mitt Romney thinks a sweep Tuesday night will set him sailing to the nomination long before the August Republican convention. While he's not playing the veepstakes game, rest assured someone inside Camp Romney is.

Robert A. Levy says that if Charles Koch controls Cato, the institute will lose its brand as a leading source of libertarian views

Congressman Paul Ryan and Senator Ron Johnson pull an April Fools' Day prank on Mitt Romney.

Hogan Gidley from the Santorum campaign responds to growing pressure for the candidate to drop out of the GOP race.

Suppose the Supreme Court strikes down the health care mandate? David Frum says: Get ready for Medicaid to grow

Trade, security and energy issues are expected to be topics on the table when leaders of the United States, Mexico and Canada meet in Washington Monday.

Julian Zelizer says President Obama should have advocated a stronger government role in providing health care

CNN's Candy Crowley reports on who's in and who's not as possible running mates for Mitt Romney.

The Republican primary calendar resumes this week with contests in Wisconsin, Maryland and the District of Columbia, all of which former Massachusetts governor Mitt Romney is expected to win.

Former Alaska governor and Republican vice presidential candidate Sarah Palin will co-host NBC's "Today" show on Tuesday, according to Megan Kopf, a spokeswoman for NBC Universal.