• Romney calls for lower taxes, releases no details

First Read: Mitt Romney, seeking to kick-start his presidential campaign among recalcitrant conservatives, will propose cutting the top income tax for individuals to 28 percent, advisers said.

• Latino voters: Missed opportunity for Republicans?

Hard-hitting immigration rhetoric is popular with conservative GOP primary voters, but may be costly in the fall because Latinos seem likely to account for a bigger share of the electorate than four years ago.

• Romney's organization meets Santorum's momentum

First Read: Mitt Romney’s campaign machine is keeping him afloat in Michigan and Arizona but Santorum is benefiting from a surge.

• For every presidential hopeful, a $1 million donor

Millionaire and billionaire executives have unlocked their personal bank vaults to write seven-figure checks to support the campaigns of President Barack Obama and Republicans Mitt Romney, Rick Santorum, Newt Gingrich and Ron Paul.

• Santorum makes prenatal testing a campaign issue

Republican candidate Rick Santorum is charging that the Obama administration's health care law requiring insurers to cover the tests is a way to encourage more women to have abortions that will "cull the ranks of the disabled in our society."