The New York Times' John Broder reports on a genuine, honest-to-goodness policy disagreement among the Democratic presidential candidates:

Senator Hillary Rodham Clinton lined up with Senator John McCain, the presumptive Republican nominee for president, in endorsing a plan to suspend the federal excise tax on gasoline, 18.4 cents a gallon, for the summer travel season. But Senator Barack Obama, Mrs. Clinton’s Democratic rival, spoke out firmly against the proposal, saying it would save consumers little and do nothing to curtail oil consumption and imports.

While Mr. Obama’s view is shared by environmentalists and many independent energy analysts, his position allowed Mrs. Clinton to draw a contrast with her opponent in appealing to the hard-hit middle-class families and older Americans who have proven to be the bedrock of her support. She has accused Mr. Obama of being out of touch with ordinary Americans who are struggling to meet their mortgages and gas up their cars and trucks....

At a meeting with voters in North Carolina on Monday, Mr. Obama said lifting the gas tax for three months would save the average consumer no more than $30, a figure confirmed by Congressional analysts. Mr. Obama has previously dismissed Mr. McCain’s proposal as a “scheme.”

“Half a tank of gas,” Mr. Obama told his audience. “That’s his big solution.”

President Bush’s spokeswoman essentially sided with Mr. Obama in saying that tax holidays and new levies on oil companies would not address the long-term problems of dependence on foreign oil.

This will be an interesting test -- if I were Obama, I'd hit the thirty dollar line very, very hard. This would seem to be a classic example of "politics as usual" and why it won't really solve long-term problems of energy and the environment.

Of course,I'm a lousy politician, so the fact that I would recommend this course of action suggests that it's doomed to failure.