Rich Miller: Vote by mail system helped Dems win big in DuPage County – Chicago Sun-Times

"It’s important to remember these consolidated elections are not always a reliable indication of the future. They’re very low turnout, and in years like this one — when the election was held during a hugely controversial U.S. president’s first 100 days — they can be influenced by the outrage of the moment, particularly when one political party was putting its finger on the scale, as the Democratic Party of Illinois was."