Democrats struck early in the battle for the U.S. House of Representatives, but numerous races that will shape the future of Donald Trump's presidency were still too close to call on Tuesday.
Democrat Jennifer Wexton ousted incumbent Republican Barbara Comstock in suburban Virginia outside Washington and Democrat Donna Shalala, a former Cabinet secretary under President Bill Clinton, captured a south Florida seat of a retired Republican.
That gave Democrats two of the 23 seats they need to capture the Republican-held House, slam the brakes on Mr. Trump's agenda and exercise renewed oversight of his administration.
In the Senate, Republicans are favoured to maintain control, and Democrats must pick up two seats to win a majority. Competitive races were too close to call in Indiana, West Virginia, Florida, Texas and Tennessee.
Senators Bernie Sanders of Vermont, a 2016 Democratic presidential contender, and Tim Kaine of Virginia, Hillary Clinton's vice presidential nominee in 2016, easily won re-election, news networks projected. Democratic Senator Sherrod Brown was projected to hold his seat in Ohio.
High-profile races for governor in Georgia, Florida and Ohio also were too close to call. A full picture of the voting results were not expected for hours, with many of the most important races considered toss-ups heading into Election Day.
The first national elections since Mr. Trump captured the White House in a 2016 upset became a referendum on the polarizing president, and a test of whether Democrats can turn the energy of the liberal anti-Trump resistance into victories at the ballot box.
The Democrats were favoured by election forecasters to pick up the 23 seats in the House, but opinion polls showed they had slimmer hopes in the Senate. All 435 seats in the House, 35 seats in the 100-member Senate and 36 of the 50 state governorships were up for grabs.
The volatile midterm campaign was marked by clashes over race, immigration and trade. In the final stretch, Trump hardened his rhetoric on issues that appealed to his conservative core supporters, issuing warnings about a caravan of Latin American migrants headed to the border with Mexico and condemnations of what he called U.S. liberal "mobs."
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