The Democratic Congressional Campaign Committee (DCCC) is up with its first ad of the 2010 cycle, and its target is Republican congressional hopeful Sean Duffy. 

Duffy is up against Wisconsin state Sen. Julie Lassa (D) in the race for retiring Rep. David Obey's (D-Wis.) seat. The race is considered a toss-up this November. 

In the 30-second spot, the committee hits the Sarah Palin-backed Republican on social security, accusing Duffy of backing a plan to privatize the benefit. "When we should be fighting to protect social security, Sean Duffy backed a plan to privatize it," the ad claims.  

The National Republican Congressional Committee fired back, calling the ad "deliberately misleading." The DCCC ad is the opening salvo in a district that will likely see plenty of outside spending this fall. Lassa has the backing of the women's advocacy group EMILY's List, and both party committees have the district in their crosshairs.