In a very Clintonian bit of semantics, Obama is careful to say he didn't take "dime from oil company PACs or lobbyists." Emphasis mine. According to USA Today, "Obama, like Clinton and John McCain, has accepted donations from oil and gas company employees — $222,309 in Obama's case from donors from Exxon, Shell, Chevron and others, according to campaign-finance data. Two oil company CEOs have pledged to raise at least $50,000 each as part of Obama's fundraising team." Or, as Factcheck.org puts it: "We're not sure how a $5,000 contribution from, say, Chevron's PAC would have more influence on a candidate than, for example, the $9,500 Obama has received from Chevron employees."
That might not be change you can believe in, but it's change that can buy a hell of a lot of ads! (Be sure to read the USA Today piece for more on how Obama gets money from lobbyists without, you know, "getting money from lobbyists.")