With every call, volunteers say they're connecting more and more with voters.
"The nice thing about phone banks is our team can call voters all across the state," said Connie Wehrkamp who's campaigning for John Kasich. "We are going door to door and other activities like that, but with phones they can be calling all the way up to the northern part of the state if we need them to."
Spreading their message and hoping to get more support.
"We need them to show up on Tuesday, and that's what our focus will be here in Michigan," said Wehrkamp.
She says they make thousands of calls a day.
Over at Bernie Sanders' campaign office in Lansing, volunteers are making calls too. They spent the morning canvassing the neighborhood.
But it's not just volunteers that are urging people to vote. Senator Cory Gardner from Colorado was in Michigan asking voters to support Marco Rubio.
"We're here talking about small businesses and the importance of small business to our economy to Michigan to Lansing and all of our country," said Sen. Gardner, R-Colorado. "This vote is critical for the success of small businesses."
Success he says starts with voting for the right person.
"We shouldn't have to settle for second best in this country," said Gardner.
Students at Michigan State have also organized a number of activities to get people to vote for Hillary Clinton, including phone banking and hosting a debate against Students for Bernie Sanders.
