Question

A Democrat can vote in a Republican primary in states that

Answer 1

A Democrat can vote in a Republican primary state that held Open primaries election.

States that hold open primaries do not compel voters to represent any party affiliation = Democrats can vote.

Answer 2

Answer: hold open primaries

An open primary is an election in which a voter does not have to be affiliated with a political party in order to cast a vote for partisan candidates. Open primaries are important because they support the idea that voters can make independent choices and that the political system is strengthened by multiple political parties.