We identify an exogenous source of variation in exposure to campaign advertising in the 2000 presidential election, based on residence in battleground states. If exposure to campaign advertising makes a potential voter significantly more likely to vote, then we should see significantly greater...

We study a game in which candidates first choose platforms and then invest in costly valences (e.g., engage in campaign spending). The marginal return to valence depends on platform polarization--the closer platforms are, the more valence affects the election outcome. Consequently, candidates...