Here's The Obama Ad Democrats Have Been Waiting For

(1) The Obama campaign pre-announces it, which means that allies and supporters know that it exists, which is good for morale.
(2) It's on taxes, and it raises a powerful point: Obama's tax cuts are deeper for more Americans than John McCain.
(3) The contrast-pivot message is clear: McCain would give oil companies a huge tax cuts (misleading -- he's cutting the corporate tax which would give every company a tax cut...Obama's also open to cutting the corporate tax rate but he'd impose a windfall profits tax on oil companies) --- and Obama'll cut taxes on the middle class.
(4) Shades of Bill Clinton in 1992....