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The Manhattan real-estate mogul earned 32 percent in Illinois. | Getty Poll: Trump leads in Illinois

Buoyed by a strong showing in the outer suburbs of Chicagoland, Donald Trump leads Ted Cruz by 10 points in Illinois, according to the results of a Chicago Tribune poll of likely Republican primary voters out Tuesday.

The Manhattan real-estate mogul earned 32 percent in the state, one of several that vote on March 15, followed by 22 percent for Cruz. Florida Sen. Marco Rubio took 21 percent, while Ohio Gov. John Kasich came in last with 18 percent, and 7 percent support another candidate or are undecided.

Trump holds a five-point advantage against Cruz in Cook County and a 14-point lead over Rubio in the surrounding suburbs, with Kasich not far behind. Cruz earned just 13 percent in the other counties surrounding the country's third-largest city by population. Downstate, however, the race is closer: Trump has 29 percent to Cruz's 27 percent.

Trump will hold an event at the University of Illinois-Chicago on Friday, while Cruz will attend a Republican fundraiser for Gov. Bruce Rauner ahead of the primary. Kasich is scheduled to campaign in the Chicago suburbs on Wednesday.

On the Democratic side, Park Ridge-born Hillary Clinton holds a large 42-point advantage over Bernie Sanders — 67 percent to 25 percent.

Research America Inc. conducted the poll from March 2-6, surveying 600 registered voters, both Democratic and Republican, who said they plan to vote or have already voted in either of their parties' respective primaries. The margin of error is plus or minus 4.1 percentage points.