Three-Way Fight on Gas Tax Holiday

Candidates spend the day going back and forth on the issue:

--Obama criticizes the holiday proposal backed by McCain and Clinton, says "this isn’t an idea designed to get you through the summer, it’s designed to get them through an election.”

--Clinton accuses Obama of not caring, says McCain doesn't have a way to fund his plan.

--While McCain says Obama "doesn't understand the effect of the high gas prices" on the economy, fires back at Clinton.