Hillary Rodham Clinton is digging in on her support of a proposed federal gas tax holiday.
Campaigning Friday in North Carolina, Clinton said that all she hears about while campaigning is gas prices, and she says she wants Congress to act. Clinton -- along with with New Jersey Senator Bob Menendez -- are planning to introduce legislation to levy a windfall profits tax on oil companies to fund the tax suspension.
Barack Obama has said a summertime suspension of the federal gasoline tax is a plan that would save at best pennies a day, "unless gas prices are raised to fill in the gap."
The proposed federal gas tax holiday has become a rare clear-cut policy difference between Obama and Clinton.