Reaching out to Hillary supporters.

A new television ad by Sen. John McCain aims to tap into anger at Sen. Barack Obama among the legions of Hillary Clinton supporters by suggesting that the Democratic nominee dissed his one-time rival.

Erasing any doubt that McCain has his sights set on Clinton voters, the new ad uses Clinton's own words to suggest that Obama passed her over because of the tough campaign she waged. The ad is titled "Passed Over."

"She won millions of votes. But isn't on his ticket," an announcer says. "Why? For speaking the truth."

Disillusioned Hillary supporters are currently like undrilled oil, there are vast untapped reserves out there.