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Has the Illinois gubernatorial race become suddenly competitive?

Based on recent pre-election opinion polling in the gubernatorial race here in Illinois, Democratic nominee J.B. Pritzker has a commanding lead over Republican incumbent Bruce Rauner, with Pritzker close to majority support in Illinois (only a plurality of the vote is needed to win election to the governor's office in Illinois).

Southern Illinois University Carbondale (SIU Carbondale) has a pre-election opinion polling operation that focuses on polling high-profile Illinois electoral races, such as races for governor, and a recent poll that they conducted had Pritzker with a commanding, but not prohibitive, lead in this year's gubernatorial race:
The poll was conducted September 24-29 and has a margin of error of plus or minus 3.1 percentage point for the entire sample. The poll covered a sample of 1,001 registered voters. The election analysis presented here is based on 715 likely voters. The margin of error for likely voters is 3.7 percentage points.

When asked, “If the election were held today…who would you vote for?” Forty-nine percent chose Pritzker; 27 percent chose Rauner with 4 percent who selected the conservative Sam McCann and 4 percent who selected Libertarian Kash Jackson. The remaining 17 percent were undecided.
However, that poll was conducted before the Cook County inspector general's finding that Pritzker engaged in a "scheme to defraud" Cook County by making a mansion that Pritzker owned uninhabitable so that Pritzker could collect hundreds of thousands of dollars in property tax refunds became public knowledge. Should Pritzker be elected governor, this would constitute an impeachable offense. As someone who voted for Pritzker via vote-by-mail in this year's general election, I view my vote for Pritzker as more of a vote against Rauner and a vote for Juliana Stratton (who is running for lieutenant governor on a joint ticket with Pritzker) than a vote for Pritzker. It's also important to note that Pritzker is in the process or repaying the money to Cook County, and that Rauner has been implicated in scandals as well, including the fact that Sterigenics, a company formerly owned by Rauner, poisoned people with cancer-causing pollution.

Nonetheless, the Ispos-UVA Center for Politics, a joint political analysis operation of Ispos and the University of Virginia, has noted that Pritzker has faced heavy criticism on social media since the inspector general's report became public knowledge:
Has the Illinois gubernatorial race become suddenly competitive? It is important to note that Illinois allows for in-person early voting and vote-by-mail without an excuse to do so, and that some ballots have already been cast or mailed in, although the number of ballots already cast or mailed in is probably an extremely small percentage of the expected total number of votes cast, probably considerably less than 1% of the expected statewide total vote. Also, there are two minor-party gubernatorial candidates, both of which combined are expected to receive more votes from people who voted for Rauner four years ago than from people voted for then-Democratic governor Pat Quinn four years ago. These two factors, the first one in Rauner's favor (very few votes already cast or mailed in) and the second one in Pritzker's favor (minor-party candidates pulling votes from Rauner), effectively cancel each other out. Another factor is the negative social media reaction towards Pritzker in response to the news about the inspector general's report. If the increased negative social media reaction to Pritzker is coming from people who are usually Republican voters, then that's a non-factor, otherwise, that could be a very serious problem for Pritzker, although tweets, Facebook posts, etc. don't vote. There hasn't been any pre-election opinion polling data from any time frame after the inspector general's report became public knowledge, so it's a big unknown if the October Surprise of the Illinois gubernatorial election has had any meaningful political effect.

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