Like in the 2016 presidential election, rural areas went heavily for Republicans on Tuesday while urban areas broke towards the Democrats.
Reacting to Tuesday's election, in which Democrats won control of the House and Republicans added to their Senate majority, President Trump praised House Democratic leader Nancy Pelosi while warning Democrats against investigating his administration.
Dean Heller, R-NV, was the sole Republican loss on the Senate Finance Committee, while one Democrat, Claire McCaskill, D-Mo. lost her seat on that committee. Republican Ron DeSantis ousted Democratic opponent Andrew Gillum by less than one percentage point in a hotly contested race in Florida; Mike DeWine won the governorship in OH; and Republican Brian Kemp was ahead of Democratic candidate Stacey Abrams by 1.6 points with 100 percent of precincts reporting. More women than ever were running, along with military veterans and minorities, many of them motivated by Trump's rise.
Another important trend from this year's exits (and any year's) is how gender interacts with race and education.
The GOP's successes were fuelled by a coalition that's decidedly older, whiter, more male and less likely to have college degrees. Republican incumbent Andy Barr fended off a strong challenged from Democrat Amy McGrath, a Naval Academy graduate and the first female U.S. Marine to pilot an F/A-18 Hornet in combat, in Kentucky's 6th Congressional District.
The future of the special counsel investigation headed by Robert Mueller could also depend on whether Democrats take control of one of the houses.
Texas is set to send its first Hispanic women to Congress, as Democrats Veronica Escobar and Sylvia Garcia both won their races.
In suburban areas where key House races will be decided, voters skewed significantly toward Democrats by a almost 10-point margin.
The road to a House majority ran through two dozen suburban districts Hillary Clinton won in 2016.
The law Democrats would use to demand the tax returns was created during the Teapot Dome scandal in the Harding administration, when lawmakers were investigating conflicts of interest during the White House at that time.
Democratic newcomer Sharice Davids defeated incumbent Rep. Kevin Yoder in Kansas to become the United States' first LGBT Indigenous person in Congress.
Not so long ago, the media consensus was that the Democrats would ride a "wave" akin to the Republican routs in 1994 and 2010.
A Republican governorship majority coupled with GOP victories in gubernatorial races in battleground states may also boost Trump in 2020, since governors hold veto power over redistricting measures.
The Republicans are on course to increase their representation from 51 to 54 in the 100-seat Senate upper chamber.
Some hurt worse than others.
Trump encouraged voters to view the 2018 midterms as a referendum on his leadership, pointing proudly to the surging economy at recent rallies.
The guest list included major donors Sheldon Adelson, Harold Hamm and Stephen Schwartzman, Cabinet members like Steven Mnuchin of Treasury and Kirstjen Nielsen of Homeland Security, evangelical leader Jerry Falwell, top aides like Conway, his wife, Melania and children Ivanka, Eric and Donald Trump Jr., Ivanka's husband, Jared Kushner, and Vice President Mike Pence.
Health care and immigration were high on voters' minds as they cast ballots, according to a survey of the American electorate by The Associated Press.
Of the special counsel's Russian Federation investigation that has shadowed his administration for more than 18 months, Trump said, "I could end it right now" but "I let it go on".
In other words, even in a year where there's a Democratic wave in the House, white women are about evenly split.
For Trump, the evening unfolded at a watch party in the White House residence, where the East Room and the State Dining Room were set up with large-screen TVs.
O'Rourke had told voters that Trump was wrong and described Texas as built from "immigrants, asylum seekers and refugees".
Several ambitious Democrats easily won re-election, including presidential prospects Bernie Sanders of Vermont, Elizabeth Warren of MA and Kirsten Gillibrand of NY.
Democratic Sen. Bob Menendez of New Jersey faced a federal corruption trial in 2017.