Just think--Nader wouldn't be such a bummer! (Score 1)

These sorts of election systems eliminate the so-called "spoiler effect," which our current system is unfortunately susceptible to. This is where a minority party's candidacy can result in the election of a candidate dissimilar to them, rather than the candidate more similar to the minority party.

Nader is accused of having this effect on the current race, and many fear that his candidacy will contribute to the election of the "greater of two evils." With approval voting, this wouldn't be an issue, as the Nader voters could instead vote that either of two choices (Nader & Kerry) would be better than the third (Bush).