His main challenger, comptroller Dan Hynes, has 23 percent support, according to the poll However, 21 percent of respondents are undecided at this early stage.
On the Republican side, the Tribune poll shows former attorney general Jim Ryan with a lead over a pack of other contenders. Ryan has support from 26 percent of respondents.
Candidate Andy McKenna has 12 percent support, state Sen. Bill Brady comes in with 10 percent, while state Sen. Kirk Dillard registered 9 percent support.
Approximately 31 percent of likely GOP voters are undecided.
The polls have a margin of error of 4 percentage points.