The Republican presidential primaries may not officially be over, but political ads on both sides have moved on to the general election.
With gas prices averaging just under $4 a gallon, President Obama's re-election campaign released a TV ad this week defending the president's energy policy and directly attacking GOP front-runner Mitt Romney.
The ad and another by Romney show that gas prices have already become a general election battleground.
Blaming the Obama administration for the recent rise in gas prices is a favorite tack among all the Republicans running for president. Newt Gingrich has promised $2.50 per gallon gas if elected. And Romney has called on Obama to fire what he dubbed the "gas hike trio": the secretaries of energy and interior, and the EPA administrator.