A new poll in Washington state shows Sen. Patty Murray (D-Wash.) trailing Republican Dino Rossi, which might explain the tone of her first TV ad of the general election. 

A SurveyUSA/KING-5 TV poll conducted Aug. 18-19 shows Rossi ahead of Murray 52 percent to 45 percent. And notably, Rossi leads among independents 59 to 35 percent.

The last SurveyUSA poll released earlier this month had Murray up 41 percent to 33 percent.

Meanwhile, Murray's new TV ad notes that "corporate lobbyists" held a D.C. fundraiser for Rossi, and "now Dino supports keeping tax loopholes for corporations that send our jobs over sees," the announcers say in the 30-second spot that was released Sunday. "Dino puts his lobbyist contributors ahead of our jobs, and that won't get us back to work."