Tonight’s viewers have largely already made up their mind
Debates are big deals, and it’s tempting to treat tonight like a potential game-changer in the campaign. But the reality is, most people who are planning to watch tonight aren’t still candidate-shopping. A YouGov/CBS News poll from late last week asked people who were planning to watch the debate why they were planning to do so; 71% said to root for their party’s candidate and 61% said to see if the other side made a mistake. Only 24% said to help them decide who to vote for.
—538’s Nathaniel Rakich