His backtracking on a government-surveillance bill has outraged the liberal blogosphere.
By finishing out the primaries, Clinton keeps faith with her fans – and maybe helps retire her debt.
Her viability is at risk if she doesn't, analysts say.
Petraeus and Crocker shared the stage with presidential hopefuls, who all had much at stake.
Clinton's positive rating has dropped, while Obama's image as a uniter has taken a hit.
New York governor met little sympathy or support over sex scandal.
Calls for his resignation mount, after the ethics crusader said he failed to live up to his own standards.
She faces heavy pressure in Texas and Ohio primaries.
He's amassed twice the delegates of rival Romney. But the GOP's conservative wing remains resistant to his campaign.
Romney remains competitive. But the Jan. 29 outcome ends the bids of Giuliani and, on the Democratic side, Edwards.