Senator Bill Nelson of Florida is being attacked during his campaign for reelection and not just by his Republican opponent Representative Connie Mack. Nelson is being attacked by super PACs. The political action group American Crossroads, which is controlled by Karl Rove, the conservative strategist, said it purchased over $6 million in airtime for this fall to tie Nelson together with President Obama.

A spokesman for American Crossroads said Nelson’s long record makes him a vulnerable target.

The new money has come from a number of sources, including Sheldon Adelson, who has donated millions in support of Mitt Romney and Newt Gingrich. Anti-Nelson television ads started in Tampa, Florida this week from another group that was recently formed called American Commitment. The new group, which is tax exempt, like the super PACs, does not have to disclose donors. The television ads are attacking Nelson for his support of the healthcare law. The new ads underscore how dramatically outside groups have changed the way political campaigns are now waged.

The House is controlled by Republicans in part due to the huge amount of outside money that was spent in the 2010 midterm election. The Republicans only need four net seats in the Senate to control it as well. Other Democrat Senators are said to be in a more vulnerable position that Nelson, but the super PACs are spreading their money and odds across the nation.

Nelson has $11 million in his coffers, which is much more than his opponent Mack is and has Republicans worried he could defeat Mack. The Mack campaign is behind and reported on Wednesday only $839,000 had been raised in the last quarter with only about $1.3 million on hand to spend. However, the outside money the super PACs will spend ensures that Nelson will be hit from all sides via television ads heading to the November 6 election.