(CN) — On Election Day in 2016, The New York Times gave Hillary Clinton an 85% chance of winning the presidency. A week earlier the respected FiveThirtyEight website gave Democrats a 70% chance of winning the Senate.
In the end, Donald Trump won by 74 electoral votes and Republicans took a 52-48 Senate majority.
Was that a fluke? A one-time black-swan outlier event? Or did it tell us something important about the country that pollsters and pundits still haven’t understood?
America has been arguing about that question for four years. And tonight will provide an answer.
A big reason we’ll get an answer is that the 2020 election is in so many ways a rerun of 2016. Consider:
· Both Clinton and Joe Biden are moderate former U.S. senators who spent eight years in the White House and had to defend their past support of NAFTA, the 1994 crime bill and the Iraq War.
· After Bernie Sanders managed a virtual tie in the Iowa caucuses and won the New Hampshire primary, Clinton and Biden each bounced back with big victories in South Carolina and then secured the nomination with the support of party leaders and black voters.
· Both led in the polls all summer despite criticisms that their campaigns were lackluster and their speaking talents uninspired. Both focused their message on Trump’s alleged incompetence and character flaws.
· The debates were memorable primarily for Trump’s being accused of being rude in “stalking” Clinton and interrupting Biden. In the first week of October, an event occurred that many thought could end Trump’s candidacy (the Access Hollywood tape, Trump’s Covid diagnosis). But Trump bounced back with a series of raucous rallies.
· Later in October it was reported that the FBI had a laptop with emails that revived a purported scandal against the Democrat.
· Going into the election, the Democrat was the overwhelming favorite.
There was talk in the party of winning red states that were purpling due to demographic changes — Texas, Arizona, Georgia. It appeared that Trump’s only chance was to draw to an “inside straight” by winning seven or eight swing states where he was tied or behind in the polls.
Tonight — or, possibly, sometime afterward — we’ll know whether this rerun has a different ending.
Here’s an overview of what to look for in the presidential and Senate races, and an hour-by-hour breakdown of the key things to watch.

The presidential race
Joe Biden has a clear lead in the polls, but nearly everyone agrees that Trump voters are more passionate in supporting their candidate. The question is whether Biden can inspire enough turnout among the people who prefer him.
A recent New Hampshire poll showed that 81% of Trump voters are voting for Trump primarily because they like him, whereas only 42% of Biden voters are primarily motivated by liking Biden; most are supporting him simply because they dislike Trump.
“It’s easier to get people to go to the polls to vote for someone as opposed to voting against someone,” said Andrew Smith, director of the University of New Hampshire Survey Center.
“Research shows that you have to have a reason to vote, and wanting someone to win is a bigger motivator than wanting someone to lose,” Smith said. “That’s especially true if you think the election is already in the bag.”
Polls don’t necessarily reflect intensity of support, and there’s also the fact that Trump voters might not admit which way they’re leaning.
“One of our surveys showed that 68% of Trump voters wouldn’t put up a yard sign and 65% wouldn’t put a bumper-sticker on their car because they’re afraid of vandalism,” Smith noted. “And 45% won’t admit they support Trump to their friends and co-workers.”