There are a number of reasons why it may take a while to know which party will control Congress next year, including laws that restrict when officials can start processing mail-in ballots, close races triggering automatic recounts and the idiosyncrasies of 50 different election systems, each with its own rules.
There’s also the potential for chaos brought on by some Republican candidates who, spurred by former President Donald Trump, have already said they won’t abide by the results unless they win.
