In a close race, every vote counts.
Republican presidential hopeful Mitt Romney is accusing his rival Rick Santorum of trying to squeeze votes out of Democrats in Michigan.
Michigan holds an open primary, so Michgian voters can vote across party lines.
One source from Grand Rapids has experienced this. Mary from Grand Rapids wrote into our Public Insight Network this morning:
Yesterday, I received 3 calls from the Santorum campaign to vote today. I am a registered Democrat. This morning I received one more from the Red, White and Blue Fund (Santorum).
More on Romney's response to this tactic from the Associated Press:
Mitt Romney says he's struggling with the Republican Party's right wing in Michigan because he's unwilling to make "incendiary" comments. He also accused rival Rick Santorum of trying to "kidnap" the presidential nominating process with automated calls urging Democrats to vote in Tuesday's primary in Michigan. Speaking to reporters hours after the polls opened, Romney suggested his rivals are making headway with the GOP base because they are willing to say "outrageous things" that help them in the polls. Romney says he's not willing to light his "hair on fire" to try to earn support. Romney also said phone calls by Santorum's campaign urging Democrats to vote against Romney in Michigan on Tuesday amount to an attempt to "kidnap the primary process." Arizona also holds its GOP presidential primary Tuesday.