The ad, released by the New Mexico Republican Party, is a combination of clips of President Barack Obama golfing and smiling paired with violence. The video also features Weh's opponent, Sen. Tom Udall (D-NM).
Halfway through the one-minute video a still shot of Foley's not-yet-identified killer is displayed for a few seconds. Foley's image does not appear in the video, just the image of the jihadist, holding a knife.
Text at the end of the video reads "to change Washington, you must change your Senator."
Last week a video of Foley, who had been missing for almost two years, being beheaded was released. The man who beheaded Foley has not yet been identified.
Udall's seat is expected to stay in Democratic hands.
Watch Weh's video below: