Chicago Teachers Union president Karen Lewis is taking the first step toward running for mayor.
A new poll for the Sun-Times concluded that Lewis would defeat Mayor Rahm Emanuel by 9 percentage points if the election were today.
Lewis now says she has already set up an unofficial exploratory committee; and she wants a representative in every Chicago neighborhood.
The calculus of a Lewis candidacy could change dramatically if Cook County Board president Toni Preckwinkle runs for mayor; the same poll gives Preckwinkle 24% lead over Emanuel.
Emanuel's campaign called the poll "laughable."