In the primary, Michigan is the make it or break it state.
"It's clear that Michigan is very important to these candidates, they would bypass us for greener pastures if we weren't."
Susan Demas from Inside Michigan Politics says, the polls are clear. On the Republican side, Donald Trump is in the lead, but if there's an upset, or if he doesn't take a big win, Demas says, "Michigan could help stop him in his tracks."
And for the Democrats, she says, "this is an opportunity for Hillary Clinton to really make a powerful stand in a big state. So I think her supporters will be enthusiastic. I think the Sanders supporters are always very enthusiastic, they've just largely been outnumbered."
There's 59 republican delegates up for grabs, and those are split up proportionally between candidates, unless one of them wins 50 percent of the vote. Then, they get all of them. On the democratic side there's 148 delegates up for grabs, and those are split up proportionally.
"We're really only a quarter of the way through the process, a lot more delegates to be allocated," said Matt Grossmann from MSU.
He thinks Michigan may be the last stop for some candidates, especially from the G.O.P., because if they get less than 15% of the vote, they don't get any delegates.
"We're the last big state before the republicans go to winner take all states in Ohio and Florida the very next week," Grossmann says.
Which is why both of them agree, on Tuesday every vote counts.