Nothing too surprising, via the AP.
About 75% agree on supporting suspension of the gas tax (not even with the windfall tax on the table), 70% of Clinton and 50% of Obama supporters, but I don't think its been much of an issue.
... AND LOOKING AHEAD TO NOVEMBER
Barely a third of Clinton supporters say they'd vote for Obama over John McCain in a November matchup. As many claim they'd vote for Republican John McCain and a quarter said they would not vote for president. If that horse race were Clinton vs. McCain, half of Obama backers say they'd vote for Clinton, about three in 10 say they'd back McCain and the rest would stay home.
The comparison that many make of Obama's situation, with that of Bill Clinton in '92 is very weak. First, the only contenders left against Clinton were Tsongas and Brown, and they were never that close to being competitive. Second, the candidacy of Perot was able to take the media presence off of Clinton, allowing Clinton to get his campaign in order, and take advantage of Perot's demise during the convention. The dynamics of '92 are not at all similar to the dynamics of '08.