With less than a month to go, a Paul Simon Public Policy Institute poll finds Vermont Senator Bernie Sanders with a 5 percentage point lead over former New York City Mayor Michael Bloomberg in the Illinois presidential primary.

The poll of 1,000 registered voters, released on Thursday by the Simon Institute at Southern Illinois University Carbondale, was conducted Feb. 10 through Feb. 17 and has a margin of error of plus or minus 3.1 percentage points.

Among voters polled, Sanders led Bloomberg 22% to 17%. Former Vice President Joe Biden had 14%, followed by South Bend, Indiana, Mayor Pete Buttigieg with 13% and Minnesota Sen. Amy Klobuchar with 8%. Massachusetts Sen. Elizabeth Warren received 6% — with Andrew Yang, Tom Steyer and “someone else” getting 1%. Yang is no longer in the race. Undecided voters clocked in at 17%.

John S. Jackson, one of the co-directors of the poll, equated the Sanders “tilt” to similar to what early voting states are seeing.

“Sanders has a dedicated base of around 20 to 30% of the primary voters, and the rest are factionalized among three to five other candidates,” Jackson said in a release about the poll. “The question will remain as to whether he can expand that base to a majority of voter or delegates.”

In January, Bloomberg picked up the endorsement of Rep. Bobby Rush, D-Ill., who was also tapped to be a national campaign co-chair. And on Thursday, Rep. Jesus “Chuy’ Garcia, D-Ill., who was a leading national surrogate for Bernie Sanders in 2016, endorsed him again.

Illinois has 184 elected delegates, with the presidential primary on March 17. Bloomberg’s entire strategy rested on ignoring the contests in February and making a strong showing in March. Buttigieg won the state-delegate battle in the Iowa caucuses and came in second to Sanders in New Hampshire.

Arizona, Ohio and Florida voters will also vote on March 17.

The poll asked voters about their take on Democratic Gov. J.B. Pritzker. The governor had a net positive approval rating of 13 percentage points — with 51% saying they approve and 38% saying they disapprove of the governor.

The breakdown among party affiliation is unsurprising. Among Democrats, Pritzker has a 77% approval rating and 14% disapproval. Among Republicans, 73% disapproved and 20% approved. With independent voters, Pritzker scored 44% approval and 43% disapproval.

Former Republican Gov. Bruce Rauner had a 37% favorability ranking in 2015 — compared to Pritzker’s 40% favorable ranking in 2019 and his current 51% approval, the poll found.

Voters were also asked about President Donald Trump’s approval, with 39% saying they approved and 58% of those polled saying they disapproved.

The poll was conducted via live telephone interviews with 56% male and 44% female respondents. Interviewers were asked to speak to the youngest registered voter at home at the time of the call.