Low voter turnout is expected in the race to replace former Congressman Jesse Jackson Jr. and some election officials worry winter weather may further complicate things.
Nearly two dozen candidates are running in Tuesday's special primary in Illinois' 2nd District, which includes Chicago neighborhoods and suburbs.
Early voting has been paltry.
In Chicago, roughly 2 percent of registered voters cast early ballots. The number is up slightly compared to a special primary election in 2009.
Overall, Chicago turnout in the 2009 primary was 18 percent. In suburban Cook County, turnout was roughly 10 percent, including early votes.
The National Weather Service has issued a storm watch for northern Illinois including Cook County.
Election officials say they're communicating with streets and sanitation workers to make sure pathways to polls are clear.