The 19 percent of “Likely voters” are not as “undecided” as the pollsters may think.
And there will be a LOT of people who have not voted for YEARS, if at all, showing up at the polls.
Including, of course, the dead in many precincts, and those who somehow, manage to vote in five or six precincts in a single day. And of course, there are always the back rooms where the votes are tallied up.
I only look at Rasmussen surveys which still has them tied but 18-19% undecided seems about average across recent polls.
An elderly friend who was born in Illinois once told me that the cheating of the Daley Machine in Chicago was about balanced by the cheating in southern Illinois by Republicans.