This is the third ad the group has aired in recent weeks; it has also been up defending Sens. Claire McCaskillClaire McCaskillGOP must avoid Dems' mistakes when replacing ObamaCare Live coverage: Mattis confirmation hearing for Pentagon Mattis's views on women in combat takes center stage MORE (D-Mo.) and Jon TesterJon TesterLive coverage: The Senate's 'vote-a-rama' Dems attack Trump SEC pick's ties to Wall Street Bipartisan group of lawmakers blast neo-Nazi rally MORE (D-Mont.).

Allen's campaign fired back against the ad. "Tim KaineTim KaineSchumer puts GOP on notice over ObamaCare repeal The Hill's 12:30 Report Kaine to vote for Mattis, oppose Tillerson 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.