AP - Republican presidential candidate Rick Perry said Wednesday that he has "no doubt" that President Barack Obama is an American citizen, staking out a definitive position on the matter after spending several days stoking widely debunked claims that the Democrat was born overseas.

AP - The flat tax is making a comeback among Republican presidential candidates. But it faces tough opposition in Congress because it tends to favor the rich at the expense of other taxpayers, renewing an old debate about "trickle-down economics."

AP - A day after he refused to endorse an Ohio ballot measure that limits public employee union rights, Republican presidential hopeful Mitt Romney said Wednesday that he is "110 percent" behind the effort.

AP - President Barack Obama urged thousands of enthusiastic college students Wednesday to make their voices heard, telling a boisterous crowd in Denver, "Young people, I need you guys involved."

AP - Joe the Plumber is plunging into politics because he thinks it's about time America had a few mechanics, bricklayers and, yes, plumbers in Congress.

AP - Republican presidential candidate Rick Perry proposed dramatic tax and spending changes Tuesday, saying he would let Americans choose between a 20 percent flat tax and the current system, allow private Social Security accounts and slash government spending and regulation.

AP - The president who ran for office promising sweeping change now finds himself calling for baby steps.

AP - Mitt Romney became a candidate Monday for the New Hampshire Republican primary.

AP - A year before the 2012 presidential election, Hispanic voters are facing a choice.

AP - It's the one major health expense for which nearly all Americans are uninsured. The dilemma of paying for long-term care is likely to worsen now that the Obama administration pulled the plug on a program seen as a first step.