LANSING, MI -- As voters make their way to their precincts this morning, polls in Michigan indicate that Republican frontrunner Donald Trump has an edge going in.

A polling average from Real Clear Politics has Trump getting plurality of the votes: 37.3 percent, followed by John Kasich at 25 percent, Ted Cruz at 19 percent and Marco Rubio at 10 percent.

On the Democratic side, that polling average has Hillary Clinton at 58.7 percent of the vote and Bernie Sanders at 37.3 percent.

A Mitchell/FOX 2 Detroit poll released Monday night had the candidates in that order but had Trump at 41 percent, Kasich at 23 percent, Cruz at 18 percent and Rubio at 8 percent. The automated poll was of 472 Michigan voters, conducted March 7 with a +/- 4.5 percent margin of error at the 95 percent confidence level.

"Trump looks likely to win, but Cruz has a strong ground operation in Michigan. The big problem for Kasich and Cruz is that they are both doing well and therefore making it more difficult for each to win," said pollster Steve Mitchell, CEO of Mitchell Research & Communications, which conducted the poll.

Kasich, who made Michigan part of his strategy early on, is making a last-minute push in the state. He made a tour of the state last week and will hold a Lansing event at noon. Cruz, meanwhile, was in the state for the Fox News Detroit debate last week and hosted an event in Grand Rapids Monday night.

Mitt Romney, who won Michigan's primary in 2012, has recorded a robo-call asking Michiganders to vote for Rubio in Tuesday's primary election.

"I'm convinced Donald Trump would lose to Hillary Clinton," Romney says in the recording.

The Mitchell/FOX 2 Detroit poll has Clinton winning big over Sanders, 61 to 34 percent. That's based on a survey of 482 likely primary voters taken March 7 with a +/- 4.46 margin of error at the 95 percent confidence level.

Both candidates have spent time in Michigan in the week leading up to the election, holding press conferences and rallies. Clinton focused on her jobs and economic plan in Michigan while Sanders hit Clinton over trade deals.

Michigan polling places are open now. For more information on finding your polling place, look here.

Emily Lawler is a Capitol reporter on MLive's statewide Impact Team. You can reach her at elawler@mlive.com, subscribe to her on Facebook or follow her on Twitter: @emilyjanelawler.