The back-and-forth on YouTube is all about oil….

In a North Carolina commercial, Clinton goes after the price of gas, proposing to use a windfall profits tax to suspend gas taxes this summer and investigate price gouging.

Sound bite: “With gas this expensive, talk is cheap.”

And here’s an Obama speech on gas given at a gas station in Indiana. It’s about lobbyists.

And here’s Clinton firing back at Obama’s criticism on her energy policy with criticism on his voting for the Cheney energy plan; she didn’t. “That bill had billions of dollars of giveaways to the oil companies.”

“I know my opponent has run ads saying he does not take money from oil companies. Well, no one does. It’s illegal. It’s been illegal for 100 years to take money from oil companies… In March, he took more money from oil company executives than any candidate, Republican or Democrat.”

A longer version of the same clip with more criticism of Obama:

Here’s that ad bragging that he doesn’t take money from oil companies: