This is the third ad the group has aired in recent weeks; it has also been up defending Sens. Claire McCaskillClaire Conner McCaskillDemocrats turn on Al Franken Trump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report MORE (D-Mo.) and Jon TesterJonathan (Jon) TesterGOP and Dems bitterly divided by immigration Senate panel moves forward with bill to roll back Dodd-Frank GOP defeats Schumer bid to delay tax vote MORE (D-Mont.).

Allen's campaign fired back against the ad. "Tim KaineTimothy Michael KaineDemocrats turn on Al Franken Avalanche of Democratic senators say Franken should resign Senate panel moves forward with bill to roll back Dodd-Frank MORE's allies can try to reframe George Allen’s record, but Virginians are looking for a leader with a record of proven pro-job-growth solutions, not the same tax and spend policies Tim Kaine has championed as Governor and as President Obama's hand-picked Chairman of the Democratic National Committee," said Allen spokesman Emily Davis. "This negative Washington ad is just more evidence that Tim Kaine wants to be a Senator for President Obama, but George Allen will be a Senator for Virginia."

The ad comes on the heels of an ad from the Republican-affiliated outside group Crossroads GPS that attacked Kaine and is running in the same media markets: Washington, D.C., Richmond and Charlottesville. The group said the ad buy size rivaled Crossroads's, which was a substantial buy.

Watch it here:

This post was updated at 7:00 p.m.

This post was updated at 1:15 p.m.