LANSING, Mich. (AP):  The Latest on the presidential primary in Michigan (all times local):

7:15 a.m.

Polls are opening across Michigan for the state’s presidential primary and elections officials say some 2 million voters could cast ballots.

Early lines were reported Tuesday morning in the Detroit suburb of Royal Oak.

Hillary Clinton and Vermont Sen. Bernie Sanders are vying for 130 delegates in the Democratic race. On the Republican side, 59 delegates are up for grabs among businessman Donald Trump, Ohio Gov. John Kasich and Sens. Ted Cruz of Texas and Marco Rubio of Florida.

Turnout could be relatively high. The secretary of state’s office notes that that there are contested primaries for both Democratic and Republican candidates, and both parties are using the primary to allocate delegates for their respective nominating conventions. The last time that happened in a meaningful way was 1992.

1:45 a.m.

Presidential candidates in both parties are looking to Michigan for one of the largest delegate hauls in the bruising nominating contests. Democrat Hillary Clinton and Republican Donald Trump are attempting to secure their hold on front-runner status.

Clinton and Vermont Sen. Bernie Sanders are vying for 130 delegates in the Democratic race. On the Republican side, 59 delegates are up for grabs among businessman Trump, Ohio Gov. John Kasich and Sens. Ted Cruz of Texas and Marco Rubio of Florida.

In recent days, the former secretary of state and Vermont senator tangled aggressively over economic issues in industrial Michigan. Republicans are fighting to ensure they garner the minimum 15 percent of votes needed to secure some delegates before big winner-take-all elections in Ohio and Florida next week.