The latest polls on the race in the Wolverine State signaled the contest was headed for a photo finish. HuffPost's Mark Blumenthal reports:
The final round of polls in Michigan has yielded one of the closest forecasts yet for the 2012 Republican primaries. Collectively, they give Mitt Romney a laser-thin margin over Rick Santorum, one that falls well within the real-world margin of error for a primary election. Either candidate could come out on top of Michigan's popular vote tonight.
In the Michigan contest, 30 delegates are at stake.
(From delegates to Twitter followers, click here for a rundown on who's ahead in the primary race.)
Check out the live blog below for the latest developments out of Michigan and the Grand Canyon State.
How will Trump’s administration impact you? Learn more