Five states hold polls on Tuesday. Here's what to know.

Five states are holding primary elections that could determine the balance of power in Congress. The races highlight internal Democratic Party divisions between moderate and progressive candidates.
Why it matters
These primaries serve as a bellwether for the ideological direction of the Democratic Party and its strategy for maintaining control of the legislative branch.
Five states hold primaries Tuesday, with competitive House and Senate races that could ultimately decide control of Congress next year.
Kansas, Michigan, Missouri, Virginia and Washington are all holding contests. A number of Democratic primaries are pitting congressional incumbents against progressive challengers.
Redistricting efforts will also influence the races. Missouri Republicans redrew their map to squeeze Democrats, while Virginia moved its primary from June to August for a Democratic redistricting push that courts ultimately threw out .
Democrats choose between moderates and progressives
The open U.S. Senate seat in Michigan, a swing state, has two Democratic candidates lodged in a tight race to win their party's nomination.
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