Illinois Gov. Pat Quinn is refusing to officially declare victory even though he's proclaimed his lead "insurmountable."
The Democrat on Thursday also wouldn't call on Republican Bill Brady to concede. Quinn says that decision is up to the state senator from Bloomington.
With 100 percent of precincts reporting, Quinn has a lead of more than 19,000 votes over Brady out of more than 3.6 million ballots that were cast.
Quinn was out at lunchtime Thursday, thanking voters at a Chicago deli. He told reporters that Illinoisans know he won the election.
He says uncertainty about the election won't affect his work.
Brady said he's willing to wait as much as a month for official results after all the ballots are counted to see if he can overcome Quinn's narrow lead.
Waiting won't be easy as Brady will have to persuade supporters to stay optimistic instead of launching a transition team. Quinn would have his own challenges if the race drags on.
The Democrat may face a fall legislative session without any certainty he'll be governor come January -- a handicap as he tries to resolve a budget deficit that could hit $15 billion next year.
He could get an early indication Thursday of how the close election will affect his ability to lead. The Senate has scheduled a vote to deal with a key issue of Quinn's: borrowing $3.7 billion to make Illinois' payment to its pension system. Quinn's office said he was not expected to travel to Springfield.
Still, the possibility of not having the election settled until the state certifies results early next month won't completely undermine government business, said Democratic Senate President John Cullerton.
"There's a process set out in state law so that situations like this are addressed. ... Regardless of the outcome, Pat Quinn is governor, and he's going to be governor until at least Jan. 10," Cullerton said in a statement.
An Associated Press survey of 90 percent of the state's election jurisdictions found as many as 50,000 absentee and provisional ballots also had yet to be counted.
"I seem to have a penchant for close elections," Brady said. "Having been through this process before I know the importance of making sure every voice is heard and every vote is counted. I believe we will win."
In February, Brady squeaked out a Republican primary win by fewer than 200 votes and was not officially declared the winner until more than a month later.
Quinn, the former lieutenant governor, has been on the job since replacing ousted former Gov. Rod Blagojevich in January 2009. But he's often been unable to get lawmakers to go along with what he wants.
Tuesday's election marked his first shot at a full term.
Democratic Rep. Jack Franks of Marengo predicted the pension borrowing plan, which stalled in the Senate last spring, would fail because there isn't enough support. That, he said, has nothing to do with the outcome of Tuesday's election.
"A mandate only applies when you have a strong, charismatic leader people believe in and are ready to follow. That doesn't characterize our governor," he said.
An unsettled election also could slow down Quinn's progress on the politically risky income tax increase he campaigned on to help relieve the state's finances. He wants to increase the tax rate from 3 percent to 4 percent to generate more money for education, although lawmakers wouldn't get behind his previous push.
Lawmakers are unlikely to tackle such a thorny issue until the winner of the governor's race is finalized, said Kent Redfield, a professor emeritus of politics at the University of Illinois-Springfield.
"They'd want to be very confident that this is part of a four-year strategy and not suddenly have to be dealing with a Gov. Brady," Redfield said.
Brady campaigned on a pledge not to raise taxes.