Dick DeVos cast his ballot in the Grand Rapids suburb of Ada early Tuesday morning.
The Republican gubernatorial candidate met with voters there, then headed across the state to suburban Detroit to do the same.
Back in the Lansing area, volunteers at campaign headquarters are making last minute calls to voters.
The campaign estimates volunteers placed more than 200,000 calls Monday. They're expected to make more than a hundred thousand on this Election Day.
Republicans hope the election will mimic their party's gubernatorial victory in 1990 when they say a last-minute push made all the difference for then-candidate John Engler.
But it's going to take hours of waiting to see if that push is working.
"It's the toughest part," campaign spokesman John Truscott said. "It could be a very, very long night tonight."