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Six weeks before Wisconsin’s presidential primary, Wisconsin’s Republican voters are leaning toward real estate mogul Donald Trump as the GOP nominee, while Vermont Sen. Bernie Sanders and former Secretary of State Hillary Clinton remain in a close race on the Democratic side, according to the latest Marquette Law School Poll.

Trump has 30 percent of GOP voters’ support, while Florida Sen. Marco Rubio has 20 percent and Texas Sen. Ted Cruz has 19 percent. Meanwhile, Sanders leads Clinton 44 to 43 percent, essentially tied.

Wisconsin’s presidential primary is April 5, and could draw a lot of attention from both Democrats and Republicans if both races remain contested then. Wisconsin’s primary takes place in a stretch of the calendar with few other contests. It also comes after a majority of delegates are parceled out, so Wisconsin’s role will still depend on what happens in the upcoming Super Tuesday elections and other key primaries on March 15.

According to the latest poll, 46 percent of Republicans said Trump is most likely to win the GOP nomination. Twenty-five percent said they expect Cruz to win the nomination, while 11 percent said Rubio would be the nominee. Among Democrats, 60 percent said Clinton would be the nominee while 33 percent picked Sanders.