A new ad from Sen. Thad Cochran (R-Miss.) released Tuesday lambastes his Republican primary for his voting record in past elections.
The narrator of the 30-second TV ad says that McDaniel, a favorite of national tea party groups, voted in the Democratic gubernatorial primary in 2003 and didn't vote in the 2004 presidential election or the 2008 Republicans presidential primary.
"If Chris McDaniel doesn't vote, why should we vote for him?" asks the narrator.
McDaniel's campaign didn't immediately respond to a request for comment. He has previously disputed records saying he voted in the Democratic race in 2003.
Cochran's campaign declined to say how much money it was spending to air the ad. It said only that it is backed by a statewide buy on network and cable.
The Cochran campaign released its new ad the same day it announced its fundraising totals for the first three months of the year. Cochran raised $1.7 million and had $1.5 million in the bank.
The primary is June 3.