Health Act Arguments Open With Obstacle From 1867  —  WASHINGTON — The Supreme Court on Monday starts three days of hearings on the constitutionality of the 2010 health care overhaul law, an epic clash that could recast the very structure of American government.

President Obama Asks Medvedev for ‘Space’ on Missile Defense — ‘After My Election I Have More Flexibility’  —  SEOUL, South Korea — At the tail end of his 90 minute meeting with Russian President Dmitri Medvedev Monday, President Obama said that he would have “more flexibility” …

NYT reporter: Santorum outburst was for cameras  —  PLAY CBS NEWS VIDEO  —  (CBS News) — When presidential hopeful Rick Santorum lost his cool with the press on Sunday, he was playing to the cameras to build support among conservative Republicans, the New York Times reporter who was on the other end …

Police: Zimmerman says Trayvon decked him with one blow then began hammering his head  —  With a single punch, Trayvon Martin decked the Neighborhood Watch volunteer who eventually shot and killed the unarmed 17-year-old, then Trayvon climbed on top of George Zimmerman and slammed his head …

Argument recap: Moving on to the mandate  —  When Chief Justice John G. Roberts, Jr., commented at the end of Monday's first day of hearings on the health care law, “We'll continue argument on this case tomorrow,” it seemed to have a secondary meaning even if he did not intend it.

Obama's health law proving successful  —  Just in time for the two-year anniversary of the passage of the Patient Protection and Affordable Care Act, the Supreme Court will hear oral arguments on the law's constitutionality this week.  —  This is a political column.

Rabbit ‘shot’ in strange new Herman Cain video  —  Former presidential candidate Herman Cain released a video Monday involving the depiction of a rabbit that is shot by a rifle after being launched into the air.  —  The graphic scene is supposed to represent “small business under the current tax code,” a young girl narrates.

Lobbyists, Guns and Money  —  Florida's now-infamous Stand Your Ground law, which lets you shoot someone you consider threatening without facing arrest, let alone prosecution, sounds crazy — and it is.  And it's tempting to dismiss this law as the work of ignorant yahoos.

James Cameron Completes Record-Breaking Mariana Trench Dive  —  Solo sub dive is deepest ever.  —  The explorer-filmmaker emerges from his sub after returning from Challenger Deep.  —  Ker Than  —  At noon, local time (10 p.m. ET), James Cameron's “vertical torpedo” …

Dogs and Cats Living Together  —  It often happens that when campaign negativity reaches a fever pitch, a candidate will take a small step back from the vitriol and say something like, “My opponent is a nice guy—he's just wrong about everything.”  What they almost never do, however, is say …