Well, we were waiting for this.
Karl Rove DID have a "suppress the vote" trick up his sleeve. Robocalls to independents and undecided voters in districts with very close races. These calls, if hung up on, automatically call back and piss off the voter. The trick? The calls sound like they're coming from the Dem candidate.
Matt Stoller has more and how to combat it. Call radio shows. Emails to newspapers. If you have some change to spare, I recommend the robocall to the NRCC for 12¢/call. Fight fire with fire.