Here are all the states where you have to register as a Democrat to vote in the primaries

The first primary contests of the 2020 election are just under three months away, and the deadlines to register to vote are coming up in several early states. 

Over the course of almost four months between February and June, nearly every US state and territory will hold a primary election or caucus to determine how they will allocate their delegates to determine the 2020 presidential nominees for each party.

But states all have different policies about who can vote in the primaries, and whether or not you have to be registered with a given political party to vote in their primary.