This terrific site contains the major TV spots of the presidential campaigns going back to 1952. I’ve linked to 1968, because I recalled a commercial the Democrats aired against VP nominee Spiro Agnew. Agnew only had two years in the governor’s chair in Maryland at the time of his nomination of memory serves correctly, but whose strength in the face of racial provocations in Baltimore impressed Nixon. Before that he’d been a county executive in Maryland. Kinda sounds familiar, no? Anyway, the ad featured only the sound of someone laughing out loud at a screen shot of "Agnew for Vice President." I’m betting the Democrats are sorely tempted to try this again.
By the way, check out the 1968 Nixon ad called "Convention."