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Third-party groups spending millions to attacks Florida Sen. Bill Nelson

U.S. Sen. Bill Nelson is facing a growing threat in his re-election campaign — and it’s not necessarily Republican rival U.S. Rep. Connie Mack.

It’s the super PAC.

American Crossroads, a political action committee overseen by conservative strategist Karl Rove, said this week it has reserved $6.2 million in air time this fall to link Nelson to President Barack Obama’s agenda.

Nelson "has a long record that makes him vulnerable," said Crossroads spokesman Nate Hodson.

That follows a $1 million injection into a new super PAC supporting Mack. The money to Freedom PAC came from casino billionaire Sheldon Adelson, who has already donated millions to super PACs supporting Newt Gingrich and Mitt Romney.

And in Tampa this week, anti-Nelson TV ads began running from another newly formed group, American Commitment, a tax exempt advocacy group that is like a super PAC but does not have to disclose its donors.

More from Alex Leary here.