While the Democrats battle, McCain can see which attacks are effective.
She wins three of four March 4 primaries, reviving her campaign and setting the stage for a long duel for the Democratic nomination.
She faces heavy pressure in Texas and Ohio primaries.
Rep. Tom Cole, head of the National Republican Congressional Committee, says voters in districts with open GOP seats will still vote Republican. But he acknowledges challenges for the November election.
Some reformers say a government-run system has become an 'economic necessity.'
Anastasia Chukovskaya sees a desire for stability that comes at the expense of freedoms.
But as the likely GOP nominee, he will face more scrutiny from Democrats.
A bipartisan bill, introduced Tuesday, would keep Americans from being flooded with automated political phone calls.