The metrics pollsters use to predict an incumbent’s chances for re-election — approval rating, satisfaction with the direction of the country, and feelings about the economy — don’t seem to work for non-incumbent elections.
The main spoiler seems to be 2000, when Clinton was popular, the economy was booming, and Al Gore lost (though the 2000 election “requires a footnote because Gore won the popular vote by 0.5 percent but ended up losing the Electoral College,” Saad says).
But it’s also true that the president’s party has lost four of the last five open presidential races, suggesting the public likes change after eight years. Or Clinton could have a leg up because she has a higher favorability rating than Donald Trump.