New Hampshire Senate candidate Paul Hodes (D) is the target of a new issue ad released Thursday by the American Action Network, a 501(c)(4) group headed by several top Republicans including former Sens. Norm Coleman (R-Minn.) and George Allen (R-Va.).

The ad accuses Hodes of supporting higher rates on electricity and higher gas prices. "Winter's here soon," the announcer says in the 30-second ad. "Guess Congressman Hodes has never spent nights sleepless, unable to pay utility bills."

The spot is airing statewide on broadcast and cable TV and radio, according to a spokesman for the group. The ad, which was produced by California-based consultant Fred Davis, is the group's first in New Hampshire. The group has also aired ads against Sen. Patty Murray (D-Wash.) and Florida Gov. Charlie Crist (I).

The Hodes camp said the ad is making "misleading and inaccurate claims."

It's a sign that Republicans are "extremely concerned by our surging campaign," Valerie Martin, Hodes's campaign manager, said on a conference call.

—Updated at 10:48 a.m. and 12:25 p.m.