Santorum mocks Romney ahead of Arizona GOP debate (AP)

AP - Rick Santorum is mocking Mitt Romney as a "Johnny come lately to the conservative cause."

Arizona finally gets GOP candidates' attention (AP)

AP - Rick Santorum is looking for another upset or two, while Mitt Romney is hoping to keep his leading rival at bay in the run-up to the 20th debate of the race for the Republican presidential nomination.

Santorum to face debate spotlight

U.S. Republican presidential hopefuls are again preparing to face each other on stage, with Rick Santorum expected to face intensified scrutiny in Arizona's debate after emerging as the main challenger to Mitt Romney.

Common prenatal tests become campaign issue (AP)

AP - First birth control, now prenatal testing? Once again a fact of life for many American women has become a jarring issue in the presidential race.

A $1M donor for every presidential hopeful (AP)

AP - Just two dozen ultra-wealthy donors are behind a surge of million-dollar contributions to the new breed of political committees during the presidential campaign.