A conservative super PAC is increasing its TV ad buy against Liz Cheney, who is vying for the Republican Senate nomination in Wyoming.

American Principles Fund initially launched its ad on Monday for a one-week flight backed by $75,000. But the group announced Thursday that it has now invested $140,000 for a three-week run on statewide broadcast and cable. The ad hits Cheney on gay marriage.

Cheney is challenging Sen. Michael B. Enzi in the Republican primary. In a statement in August, Cheney said there was a push poll being conducted against her on this issue and that she is “not pro-gay marriage.”

The group is promising to invest further in this and other races around the country.

“The feedback we’ve gotten from APF’s launch and our first ad has been tremendously positive — consider us ‘all in’ both in Wyoming and any other important race in which there is a clear contrast between the candidates on a defining moral issue,” APF board member Frank Cannon said in a statement.

Watch the ad here:

https://www.youtube.com/watch?v=JHFfjDe9djw