Playing a starring role in Tuesday's primaries: Darth Vader

Voters across four states pick their candidates Tuesday for downballot offices, including in multiple House races where incumbents are in danger of losing, in one of the biggest primary nights of the year. Donald Trump is doing his part to make this night eventful by endorsing 12 candidates in eight competitive races—yes, you read that right. 

Below, you'll find our guide to all of the top primaries to watch, arranged chronologically by each state’s poll closing times. When it’s available, we'll tell you about any reliable polling that exists for each race, but if we don't mention any numbers, it means no recent surveys have been made public.