US election day: All you need to know
Numbers start to come in after in-person voting closes at 3am UAE time on Wednesday.
US election day is finally here, and 100 million people have already voted by mail or in person.
Millions more were to vote in person on Tuesday, and the winner -- Republican President Donald Trump or Democratic challenger Joe Biden -- won't be known until the evening at the earliest.
But the battle to achieve a majority 270 electoral votes, earned by winning the popular vote in individual states, has been so close that knowing the winner could spill over into Wednesday or even longer, and result in legal battles over the vote count.
- When are the first vote tallies reported? -
Numbers start to come in after in-person voting closes at 6:00 pm Eastern Time (EST) (3am Wednesday, UAE) in parts of two states, and then build as more states stop allowing votes in the hours after.
Most close by 9:00 pm EST (6am UAE), opening the way for a gusher of vote tallies over the following hours, with some districts and states reporting faster than others.
Several, including California, the largest, only close at 11:00 pm EST (8am UAE), and Hawaii and Alaska, small voter-wise, vote until midnight and 1:00 am EST (10am UAE), respectively.
- States to watch -
Given that opinion polls already indicate clearly which way 38 of the 50 states will go, the focus is on 12 key states.
The first ones to watch are the eastern states of Georgia, where polls close at 7:00 pm (4am UAE); Florida, where, depending on the district, polls shut at 7:00 pm or 8:00 pm (5am UAE); North Carolina where polls close at 7:30 pm (4.30am UAE); and the western state of Arizona at 8:00 pm EST.
Based on projections for the "decided" states, it is possible that if Biden captures Florida and two of the above others, he could be judged the overall winner of more than 270 electoral college votes early in the night.
But, using projections, even if Trump wins all of the above four, the overall victor would still be unclear.
- How is the victor decided? -
Officially, the winner of the White House is not decided until every state has certified its vote count which, given delays for mailed-in ballots, could be a week or more in some places.
But the race is typically "called" by major news organizations on election night, based on their tabulations of reported totals, district by district.
They make a decision on the winner of each state, and finally the entire election, when it appears there is no mathematical way for one candidate to overcome his deficit and the other has a sure path to the magic number of 270 electors.
Ronald Reagan's 1980 landslide victory was called at 8:15 pm EST on election Tuesday (5:15 am UAE Wednesday).
But in 2016, Trump's victory over Hillary Clinton only became clear at about 1:30 am EST (10.30am UAE) Wednesday when tallies showed he had won Pennsylvania. Still, Clinton only conceded an hour later after Wisconsin fell to Trump.
And in 2000, the election came down to who won Florida, where the candidates were divided by a few hundred votes. The two parties battled for weeks legally until the Supreme Court weighed in and halted recounts, handing the election to George W. Bush.
- So, when will Tuesday's result be known? -
It could be 11:00 pm EST or earlier if Biden sweeps the first key states reporting.
If not, the timing will depend on how subsequent key states fall. And that could be drawn out.
In Pennsylvania, the most prized battleground, polls shut at 8:00 pm. But officials say that slow counting of a gusher of mail-in votes could delay the outcome until Wednesday or later.
The same could be true in Michigan, Wisconsin and other key states.
Any possible ballot-by-ballot recounts and lawsuits over the tallies could delay naming the victor for days or even weeks.
- Legal battles -
In fact, both parties have geared up for legal fights in several states where a favorable court judgment could tilt the results one way or another.
In Pennsylvania, Republicans are prepared to litigate a state decision to accept mail-in ballots that arrive up to three days after Tuesday. With Democrats more likely to vote by mail than Republicans, they want those ballots nullified.
In Texas Republicans are seeking to invalidate 127,000 votes in a Democrat stronghold because they took place in drive-thru tents allegedly not permitted under state rules.
And in a heavily Democratic district in Nevada, Republicans have sought to halt the counting of mail-in votes to be able to more closely examine them, with an eye to throw some out.
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