Due to gerrymandering and demographics, many Congressional and political districts are un-winnable for Democrats and unlosable for the Republican incumbent. When a district is drawn to be "unlosable," moderate Republican incumbents are forced to take extreme positions to satisfy the base of voters who vote in primaries.
In districts where Democrats really can't win, we believe that voting in the Republican primary is essential to fighting extremism and electing sane, accountable politicians. In some states, voters must register as Republicans to vote in the primary. We teach them how using standard voter registration techniques. In others states, we educate voters about the power of primary voting and about the danger of specific, extreme candidates.