How Biden Won: Ramping Up The Base And Expanding Margins In The Suburbs

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Residents of Gwinnett County in Georgia hold Biden-Harris campaign signs on Election Day in Norcross, Ga. President-elect Joe Biden ran up the margins in Atlanta’s diversifying suburbs.

Jessica McGowan/Getty Images

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Jessica McGowan/Getty Images


A polarized America

When looking at the map of how all 3,141 counties or county equivalents in the 50 states, plus Washington, D.C., shifted — or didn’t — from 2016 to 2020, it’s clear this is a very divided country.

The overwhelming majority of counties didn’t change hands. But voters in many parts of the highly populated Northeast; in cities in key Midwestern states, the West and West Coast; as well as in lots of suburban areas went for Biden by wider margins than for Clinton.

And rural areas and many places with high concentrations of white voters without college degrees went even more strongly for Trump than in 2016. That was seen as a tall task, given he won a record margin with this core group four years ago.

Trump promised to turn out more of them and did so, but Biden’s gains, primarily in the suburbs, offset that turnout. Biden currently holds an almost-6-million-vote lead in the popular vote. Trump lost by almost 3 million in 2016.

Philadelphia’s Suburbs Helped Deliver Crucial Pennsylvania For Biden

Notably, Trump also made inroads in counties with significant Latino populations in places like South Florida and South Texas. Those improvements helped Trump win those two big states more comfortably than the pre-election polls had shown.

In Texas in particular, it’s notable that Biden did better than Clinton in 2016 in Dallas, Austin, Houston and in some surrounding suburban counties. But that was offset by Trump’s gains in South Texas and the increased turnout in more rural areas.

So just looking at the map, the country looks stretched even further apart. Trump remains one of the most polarizing figures in American presidential history, and President-elect Biden inherits a deeply divided nation in the midst of health, economic and racial crises.

A deeper look at 5 key states that flipped red to blue

Arizona: Every election, most of the vote in Arizona comes from Maricopa County, home to Phoenix. That was no different this year, as more than 60% of the state’s vote came from Maricopa. So winning it is key. And that’s exactly what Biden did.

Biden became the first Democrat since Harry Truman in 1948 to win Maricopa, which is fast-growing and diversifying. (Note that in the graphic below, Maricopa is listed solely as an urban county.) Biden defeated Trump there, 50% to 48%, or by about 45,000 votes. His statewide margin: a little over 10,000.

Trump actually increased his margins in the rural counties overall, but Biden also gained significantly in Pima County, where Tucson is. There, Biden won by 40,000 more votes than Clinton in 2016.


Michigan: Votes for Democrats in Michigan start in Detroit, or Wayne County. About one-in-five Biden votes in the state came from Wayne County. He won it by 32,000 more than Clinton did.

But Biden also flipped Kent County, home to Grand Rapids, winning 31,000 more votes than Democrats did 2016.

Biden made up even more votes in the suburbs, improving more than 94,000 over 2016 just from four counties — Oakland, Washtenaw, Macomb and Ottawa. And more than half of those votes came from Oakland.

Like in other places, Trump expanded here in rural areas, but not enough to offset Biden’s improvements, for a 51%-to-48% win, or 145,000 votes.

Remember, this is a state Trump won by just over 10,000 votes in 2016.


Pennsylvania: For as much attention as Philadelphia vote-counting has attracted from the president, Pennsylvania was all about the Philadelphia suburbs.

Biden actually won Philadelphia by thousands fewer votes than Clinton. But he more than made up for it in the suburbs. In just four counties — Montgomery, Delaware, Chester and Bucks — Biden improved on the 2016 margin by about 100,000 votes.

Trump did gain in some rural counties, but this is one state where Biden did cut into Trump’s margins in some redder places, like Lancaster County.


Wisconsin: Trump won here in 2016 by fewer than 23,000 votes. Biden, though, won it by 20,500 votes (pending a recount). So every vote counted.

Biden turned out more Milwaukee County voters and won by a 20,000 more votes than Clinton did in 2016. But Biden’s biggest vote gain came from Dane County, home to Madison and the University of Wisconsin. He won there by 35,000 more votes than Clinton did in 2016.

Biden also chipped away in some more rural and suburban areas, even Waukesha, the heavily Republican county. Biden cut into Trump’s margin there by 7,500 votes.


Georgia: Like Pennsylvania, Georgia was all about the suburbs around one city, Atlanta. Though The Associated Press hasn’t called a winner in the narrowly contested state, Biden rode a demographic wave of change in Georgia to likely become the first Democrat to win it since Bill Clinton in 1992.

Back then, though, Georgia was far more white. Now, it is nearly evenly split white to nonwhite. Trump won the state by more than 211,000 votes in 2016, but Biden made up for that in and around Atlanta.

Biden won an almost 65,000 wider vote margin than Clinton in Fulton, where Atlanta itself is, but also more than 190,000 in the suburbs of DeKalb, Gwinnett, Cobb, Clayton and Henry counties.


Sean McMinn and Daniel Wood contributed research and data visualizations.

  • 2020 presidential election


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