How are voters affected by party policy ambiguity? Parties can communicate ambiguous policy positions in three ways: They can send conflicting messages, they can use vague language, and they can avoid communicating any stance on a given issue at all. We expect that voters are more likely to vote for a party if its positions are clear than when they are ambiguous. However, we expect that some types of ambiguity affect citizens’ vote choices more than others. We present evidence from a series of survey experiments that support our hypotheses. Our findings have serious implications for our understanding of how party policy ambiguity affects vote choices, and in turn how it affects party competition, and political representation.