Let's pretend it's the middle of October, and John Doe and Jane Smith are both seeking the same U.S. Senate seat. Doe, who is down a few points in the polls, hears a rumor that Smith attended a fund-raiser sponsored by a Jewish group at the home of a couple who happen to be Jewish.
Doe's campaign runs a television ad, replete with scary music, that says: "Jewish Americans and Jane Smith. She hid from cameras. Took 'Jewish' money. What did Jane Smith promise in return?"