From the LA Times:
The Republican presidential candidates clashed bitterly and personally over healthcare and immigration in a snarling Tuesday night debate that featured some of the most barbed and heated exchanges of the months-long campaign.
The event, staged in a hotel casino on the Las Vegas Strip, broke little new substantive ground as the candidates — facing one another for the sixth time in as many weeks — restated mostly familiar positions.
But there was a heightened degree of animus in the air, which pushed the usually unruffled Mitt Romney into a series of raised-voice, finger-jabbing confrontations, most dramatically with Texas Gov. Rick Perry.