Four years ago, President Barack Obama was in somewhat the same position that Donald Trump is in now.
Obama's first debate against GOP presidential nominee Mitt Romney had gone badly, and advice was flooding in from all directions. But one suggestion really hit home, Obama's former chief speechwriter Jon Favreau recalled.
"You don't win the second debate," former president Bill Clinton told Obama, "by relitigating the first one."
Trump might also do well to heed that counsel - especially because the next debate, on Sunday night in St. Louis, will be conducted in a town-hall style format.
Half the questions will come from an audience of undecided...