There is a sizable literature on the causes and effects of candidate positioning in elections. An implication of this research is that candidates present clear issue positions to the electorate and citizens then make voting decisions based on this information. However, if candidates are ambiguous in the positions they take, this may impair voters’ decision-making and prompt voters to punish them for inconsistency. Although there is a growing literature on the effects of candidate and party ambiguity, consensus on the implications of ambiguity for candidates and voters is yet to be achieved. Using data from the 2010 House elections, we find that candidate ambiguity undermines voters’ ability to vote consistent with the spatial logic just as Downs speculated. We also find, in contrast to Downs, that voters punish rather than reward candidate ambiguity. We suggest that a possible mechanism is in voters’ valence ratings of candidates.