One day after endorsing George Allen (R) in Virginia’s U.S. Senate race, the U.S. Chamber of Commerce unveiled its latest advertising attack on his opponent, fellow former governor Timothy M. Kaine (D).

The pro-business group, which frequently backs Republicans, was on the air earlier this year with a spot criticizing Kaine and praising Allen, and now it is back up with a new hit on the Democratic nominee in the contest to succeed retiring Sen. James Webb (D).

The ad says Kaine’s “big-government policies would take Virginia down the wrong track,” accusing the Democrat of proposing “billions in new taxes” when he was governor and supporting more regulations on businesses and higher energy prices. The spot also takes him to task for backing President Obama’s health-care bill.

“As senator, Tim Kaine would derail Virginia’s recovery,” the ad says.

Kaine spokeswoman Brandi Hoffine said the Chamber ad distorted Kaine’s strong record in the statehouse.

“As governor, Tim Kaine helped guide Virginia through the worst recession since the Great Depression,” Hoffine said. “He cut $5 billion, including his own pay, and balanced Virginia’s budget all four years. ... He’s offered a forward-focused vision to do the same as a senator in Washington, while George Allen has admitted he helped create our economic mess during his first term in the Senate and has offered no new ideas to fix it. That’s a pretty clear choice.”