Click here to watch "Both."

What's the most effective way to attack a Republican candidate this election year? Judging by recent ads from MoveOn.org, Americans United for Change and a slew of other liberal groups, Democrats think the answer to that question will be much the same as it was in 2006: tie the candidate to the policies of President Bush.

The Defenders of Wildlife Action Fund, an environmental advocacy organization, is the most recent group to take up this line of attack, releasing its second ad of the New Mexico Senate race against Republican Rep. Steve Pearce. Pearce, who represents the state's 2nd District, is vying for the open Senate seat against Democratic Rep. Tom Udall.

"Both" (subscription), which was released Friday, is the first ad of the general election, which began last week when Pearce narrowly beat out Rep. Heather Wilson for the GOP's nomination. "Call Steve Pearce and tell him we need lower fuel costs, not more support for George Bush and Big Oil," urges the ad's announcer. The spot cites congressional votes suggesting that Pearce and Bush support tax breaks for oil companies and oppose increasing fuel mileage standards.

"Pearce and Bush, as best we can tell, see eye-to-eye on energy policy, so it's perfectly logical in our minds to equate the two of them," said Rodger Schlickeisen, the organization's president. "We're also aware that Bush is not widely popular right now" in the Southwest because he has supported drilling there -- which, Schlickeisen added, "destroys the quality of life."

This ad echoes an earlier TV spot Defenders of Wildlife released during the primary campaign that chastised both Pearce and Wilson for their positions on energy policy and contributions from oil companies. The group has previously indicated it will be focusing on New Mexico this cycle, and Schlickeisen said "Both" won't be the last ad they release during the general election campaign.