Most campaign ads, like most billboards or commercials, are unimaginative and formulaic. Our candidate is great! Their candidate is terrible! Choose us!
With the huge majority of political ads, you would look back on them long after the campaign only for time-warp curio purposes—Look at the clothes they wore in the 80s! Look how corny “I like Ike!” was as a slogan! Look how young [Mitch McConnell / Bill Clinton / Al Gore] once was!—or to find archeological samples of the political mood of a given era.
The few national-campaign ads that are remembered earn their place either because they were so effective in shifting the tone of the campaign, as with George H. W. Bush’s race-baiting “Willie Horton” ad against Michael Dukakis in 1988; or because they so clearly presented the candidate in the desired light, as with Ronald Reagan’s famous “Morning in America” ad in 1984. Perhaps the most effective campaign advertisement ever, especially considering that it was aired only one time, was Lyndon Johnson’s devastating “Daisy Girl” ad, from his campaign against Barry Goldwater in 1964. The power of the Daisy Girl ad was of course its dramatizing the warning that Goldwater might recklessly bring on a nuclear war.