^Because, she doesn't have to. She's as crafty as she is evil.
The congressional ban on off-shore drilling expires Sep. 30. All the Dems have to do is sit back and allow the ban to expire, thereby not requiring Barrack Hussein Obama to reiterate his point of view, which he may then flip-flop on again later. You do have your tires properly inflated don't you.
Pelosi will take the heat for not allowing a vote to lift the ban. Meanwhile, she's telling Dems up for re-election this year to proclaim their support for more drilling, if will help them politically:
http://www.politico.com/news/stories/0808/12304.html
Then, when Hussein gets elected, they can reinstate the ban.
The Dems are betting the farm on Obama. They're either going to break the bank, or end up shooting themselves in the head.
-bean