Liz Halloran

A clearly divided U.S. Supreme Court on Tuesday took up the centerpiece of President Obama's health care law: its requirement that by 2014 individuals have insurance coverage or face a penalty.

In contrast to Monday's dense and technical arguments, Tuesday's session was filled with sharp rhetorical volleys and clever analogies. Here are some of the more telling exchanges between the lawyers and the high court justices.

The U.S. Supreme Court on Monday opened three days of oral arguments over the constitutionality of the insurance requirement embedded in President Obama's landmark health care law with a simple question and an obscure 1867 law.

The question: Does the court even have the right to hear the health care challenge, given that the Anti-Injunction Act prevents federal courts from taking cases where taxpayers are trying to prevent the government from "assessing or collecting" taxes?

The U.S. Supreme Court is set to begin hearing oral arguments Monday in a Republican-led challenge to the national health care law that has convulsed the country and its political class for more than two years — and may well define President Obama's tenure in the White House.

Rick Santorum won two Southern state GOP presidential primaries Tuesday, embarassing Mitt Romney who had predicted he'd take one.

Second-place finisher Newt Gingrich vowed to fight on to Tampa, tag teaming Romney along with Santorum. The "three-way dynamic," as he put it, is a winner for Gingrich and, perhaps, his dream of deal-making at the convention, and for Romney, too, whose Southern result could have been much worse if he'd been posting up against Santorum alone.

Mitt Romney's stilted efforts to relate to Dixie voters by tossing off a few "y'alls" and references to grits have been roundly mocked as awkward pandering.

And rightfully so, says political scientist Marvin King, who cringed at the GOP candidate's sprinkling of vernacular and Southern stereotypes into his patter during appearances in Mississippi and Alabama. The two states hold their Republican presidential primaries Tuesday.

"You can tell Romney wasn't expecting to campaign down here, and it shows," says King of the University of Mississippi.

Texas Congressman Ron Paul hasn't won any of the 23 Republican presidential primaries or caucuses already in the 2012 history books.

He's captured only 29 delegates, just five percent of those awarded in contests to date. (Frontrunner Mitt Romney has 340 committed delegates, 58 percent of those officially allotted, according to NPR calculations.)

Republican presidential candidate Mitt Romney told a reporter Wednesday that he opposes a measure being considered by the Senate that would allow employers to decline to provide contraception coverage to women.

"I'm not for the bill," Romney said during an interview with Ohio News Network reporter Jim Heath. "But, look, the idea of presidential candidates getting into questions about contraception within a relationship between a man and a woman, husband and wife, I'm not going there."