Poll: Trump leads in Wisconsin
© Greg Nash

Donald TrumpDonald John TrumpPossible GOP challenger says Trump doesn't doesn't deserve reelection, but would vote for him over Democrat O'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms MORE is the number one GOP presidential pick in a poll of Wisconsin Republican voters.

The real-estate mogul garners 20 percent support, according to a poll live-tweeted by the University of Marquette Law School on Wednesday.

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He’s followed by Ben CarsonBenjamin (Ben) Solomon CarsonCarson's affordable housing idea drawing undue flak Overnight Energy: Trump EPA looks to change air pollution permit process | GOP senators propose easing Obama water rule | Green group sues EPA over lead dust rules Green group sues EPA over lead dust rules it says are too lax MORE at 16 percent, Sen. Marco RubioMarco Antonio RubioTrump moves forward with F-16 sale to Taiwan opposed by China The Hill's Morning Report — Trump and the new Israel-'squad' controversy Trump crosses new line with Omar, Tlaib, Israel move MORE (R-Fl.) at 14 percent, Carly Fiorina at 11 percent, former Florida governor Jeb Bush at 7 percent and Sen. Ted CruzRafael (Ted) Edward CruzTrump moves forward with F-16 sale to Taiwan opposed by China The Hill's Campaign Report: Battle for Senate begins to take shape O'Rourke says he will not 'in any scenario' run for Senate MORE (R-Texas) at 5 percent.

Trump is up 11 points since the poll’s last iteration in August. Other big risers are Rubio, who is up 7 points, and Fiorina, who is up 4 points.

The poll attributes the businessman’s success to his favorability among former supporters of Wisconsin Gov. Scott Walker (R), who dropped out of the race last week.

Trump claims 22 percent of those who say they would have supported Walker’s presidential bid, the most among any candidate. Rubio garners 14 percent of ex-Walker backers, followed by Carson with 11 percent, and Cruz with 10 percent.

Twenty-eight percent of respondents say they would have supported Walker’s campaign had he stayed in the race.

Although Trump is the first choice among a plurality of Republican voters in the state, only 5 percent of respondents choose the real estate-mogul as their second option.

Rubio is the favorite runner-up, with 17 percent of voters choosing him second, followed by Fiorina with 15 percent and Carson with 12 percent.

The poll surveyed 321 Republicans in the state through landline and cell phone calls from Sept. 24 – 28. The margin of error is 6.5 percent.