A powerful conservative advocacy organization is about to unleash a $25 million advertising assault in ten different states, seeking to highlight inconsistencies in President Obama's record.

Entitled Obama's promise, the ad features clips from Obama's 2008 campaign in which the president vows action on initiatives that include helping struggling homeowners and narrowing the deficit, and then notes how Obama has fallen short. The commercial is set to run in Colorado, Florida, Iowa, Michigan, North Carolina, New Hampshire, Nevada, Ohio, Pennsylvania and Virginia.

The massive ad buy is the latest salvo in what many are predicting will be the most expensive presidential race in American history, matching a $25 million, nine-state push the Obama campaign announced earlier in the month.

Founded with the guidance of Karl Rove, a prominent Republican operative and former top adviser to President George W. Bush, Crossroads GPS is one of many third party organizations empowered by the Supreme Court's Citizens United ruling. Crossroads GPS can raise and spend unlimited amounts of money and does not need to disclose its donors; a Washington Post analysis found that the vast majority of the money it raised in 2011 came from a small handful of individuals or organizations.

You can watch the ad here: