A recent poll shows that if Chicago’s mayoral election were held now, union leader Karen Lewis would beat Rahm Emanuel.

“If the mayoral election were held today, the lightning rod union leader who was the architect behind a 2012 teachers’ strike would beat Emanuel by 9 percentage points in a head-to-head contest, the survey found.

“Lewis was leading Emanuel 45 percent to 36 percent with 18 percent of the likely voters undecided.

“And Emanuel could face an even steeper hill if he faces Cook County Board President Toni Preckwinkle, long considered his most formidable challenger.

“A head-to-head contest found Preckwinkle romping Emanuel by a stunning 24 points.

“Preckwinkle dominated with 55 percent of those surveyed. Emanuel notched just under 31 percent.”