The race to the Republican presidential nomination remains up in the air. Watch CNN.com Live for all the latest news and views from the campaign trail.
Today's programming highlights...
8:30 am ET - Pro-Affordable Care Act briefing - The Supreme Court holds a third day of hearings on the legality of the Affordable Care Act. The hearings are not televised, but there's plenty of action outside the courthouse. Supporters of the law brief reporters this morning, then rally at 10:00 am ET. Senate Democrats discuss the law at 12:00 pm ET, followed by their Republican colleagues at 2:00 pm ET.
10:30 am ET - Santorum talks health care - GOP presidential candidate Rick Santorum campaigns in Wisconsin today, starting with a discussion on health care in Sparta. He then goes bowling with College Republicans in La Crosse at 12:45 pm ET, followed by a restaurant rally in Onalaska at 2:00 pm ET.
11:00 am ET - Senators talk Syria resolution - Sen. John McCain and others unveil a resolution condemning the Syria's government for crimes against humanity.
12:45 pm ET - Biden talks economy - It's not just Republicans on the campaign trail today, as Vice President Biden heads to Davenport, Iowa, to discuss the U.S. economy.
5:00 pm ET - Gingrich discusses Social Security - He may be laying off staff and charging for photos, but GOP hopeful Newt Gingrich isn't giving up on his presidential aspirations. He'll talk the future of Social Security at an event in Washington.
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