Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

1. In this millennium, Democratic presidential candidates are 3-0 when they have a person of color on the ticket; they are 0-3 when they don't. It's an important indicator of a changing America and its diversity.

2. Once again we see an election where independent voters were the deciding factor in picking the winners across America. No longer are we at a point when either party will steal many votes from the other party. It is independents that swung the elections in 2016, 2018 and 2020.

3. The electoral state landscape again continues to shuffle. Democrats and Republicans would be wise to no longer bet on swing states of the past, but invest more in swing states of the present and future.

4. There are many bright lights -- as well as warning signs -- for both parties from this election. Both parties have work to do if they want to emerge as the true majority party from election to election.

5. Finally, and I noted this after the 2018 election, when issues are put on the ballot divorced from a partisan brand, there is an incredible ability to get voters to support policies outside their partisan boxes.

-ABC News Political Analyst Matthew Dowd

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Joe Biden visited the grave of his son Beau after attending church with his family on Sunday morning.

Biden was seen walking with his daughter Ashley and grandson Hunter, Beau’s son, toward Beau’s grave after departing church in Wilmington, Delaware, just before 11:30 a.m., according to a pool report.

This was the first time Biden visited his son's grave since Election Day.

The year 2020 has been one of the most tumultuous in history -- with a pandemic, an economic collapse, a searing racial reckoning and wild leadership out of the Oval Office.

Biden launched his campaign as a battle for the "soul of America." Winning, though, doesn't come close to ending that battle -- and will test both Biden and his fellow Americans through what promises to be a tense period in the nation and beyond.

Biden's first statement as president-elect sought to strike a note of unity.

"Democracy beats deep in the heart of America," he said in the statement released by his campaign. "With the campaign over, it's time to put the anger and the harsh rhetoric behind us and come together as a nation. It's time for America to unite. And to heal."

-ABC News Political Director Rick Klein

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The Biden-Harris transition team launched its full transition website, BuildBackBetter.com, and social media channels to make sure the American people “know where to go to learn more information about plans for a Biden-Harris Administration."

Agency review teams will begin their duties this week, which will include gaining access to federal agencies at the appropriate point, the campaign said. Biden will also launch his COVID-19 task force, which he announced Saturday in his address to the nation. 

-ABC News' Molly Nagle and Benjamin Siegel