Americans United for Change will begin airing a radio ad in Las Vegas tomorrow that attacks Nevada Republicans Rep. Jon Porter and Sen. John Ensign for voting against the Lily Ledbetter Fair Pay Act.

Porter voted against the bill when it passed the House in July, and Ensign voted against a motion to consider the bill in the Senate last week. The Senate motion failed.

The bill seeks to combat pay discrepancies for women and minorities. Americans United for Change says the ad will run for the rest of this week and most of next week. Listen to the ad here.