Updated 10/7/2013 at 12:48pm
(CNN) - Liz Cheney's family name may not be enough to confirm conservative bona fides in Wyoming, with a new Super PAC attack ad alluding to liberal values for the Senate hopeful.
"MSNBC. The go-to network for Barack Obama and Washington's liberal elites. So what's Liz Cheney doing here?" says the voiceover narration on the new TV commercial from the social-conservative American Principals Fund.
The spot features some of Cheney's statements on gay marriage to MSNBC. In the clips used, Cheney argues against a Constitutional amendment that would ban same-sex marriage and says she supports the State Department's extension of benefits to same-sex partners.
The ad concludes by saying that Cheney is "wrong for Wyoming."
Cheney aide Kara Ahern lambasted the attack ad.
"This is a dishonest smear by an out of state superPAC. The people of Wyoming deserve better," Ahern said in a statement.
Earlier this year Cheney launched a primary challenge to try and unseat three-term GOP Sen. Mike Enzi in a campaign much of the Wyoming Republican establishment has looked down on.
The eldest daughter of former Vice President Dick Cheney has said she is not in favor of gay marriage.
"I am strongly pro-life and I am not pro-gay marriage," Cheney said in an August statement, despite having a sister who married her longtime partner in Washington, D.C. last year.
"I believe the issue of marriage must be decided by the states, and by the people in the states, not by judges and not even by legislators, but by the people themselves."
In a statement, American Principals said they are trying to "break the unilateral truce on social issues within the GOP by demonstrating that social issues are winning issues, especially when combined with an economic message that addresses voters' most urgent concerns."
The group's executive director and a consultant for Tsamoutales Strategies, Sarah Huckabee Sanders, said in the statement that the "truce" is bad for both the GOP and the United States. "Our core values are under attack, and we will stand for those who stand for what's right," she said.
–CNN Political Reporter Peter Hamby contributed to this report.