WASHINGTON (AP) -- Twenty Republican presidential debates later, the head-scratching claims kept coming....

MESA, Ariz. (AP) -- Primed for a fight, Mitt Romney and Rick Santorum traded fiery accusations about health care, spending earmarks and federal bailouts Wednesday night in the 20th and possibly final debate of the roller-coaster race for the Republican presidential nomination....

MESA, Ariz. (AP) -- The Republican candidates say more must be done to combat illegal immigration....

MESA, Ariz. (AP) -- Republicans Rick Santorum and Mitt Romney are sparring over Santorum's support for his former Senate colleague, Arlen Specter of Pennsylvania....

WASHINGTON (AP) -- President Barack Obama is reaping political benefits from the country's brighter economic mood. A new poll shows that Republicans and Democrats alike are increasingly saying the nation is heading in the right direction and most independents now approve the way he's addressing the nation's post-recession period....