She was expected to lose to political newcomer Jennifer Wexton.
The US leader also acknowledged the significance of the midterm elections for his presidency.
In Georgia, Democrat Stacey Abrams is seeking to become the first black woman to be elected governor of a U.S. state and in Florida, Andrew Gillum, the African-American mayor of Tallahassee, is waging a bitter battle against Trump acolyte Ron DeSantis.
- Access to abortion and abortion funding is on the ballot in three states.
To win a majority, the Democrats need to flip 24 Republicans seats and hold onto the 194 seats they already hold.
In Ohio, Democratic Sen.
Facebook's purge is part of countermeasures to prevent abuses like those used by Russian groups two years ago to sway public opinion ahead of the 2016 United States presidential election.
Here comes the first big wave of races - nearly 30 competitive House races, five competitive Senate races and seven big ones for governor.
But where the Republicans should be singing the praises of an economy firing on all cylinders, Trump has been hewing closely to his 2016 playbook, relentlessly rallying his red-hatted supporters with a war footing against a South American migrant caravan slowly making its way through Mexico. Five of those seven seats were also held by Republicans.
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New Jersey and Pennsylvania are important pieces of the puzzle for Democrats in their hopes of taking back the House. Unlike many other news organizations, we have not put up a paywall.
Just one state closes this half hour.
And the sudden emergence of a huge caravan of migrants heading toward the U.S. border just before the election has also fired up both bases, but especially conservatives who are concerned about border security. If Trump manages to pull off a victory in terms of retaining control of one or both Houses, it will be seen as a validation of his stand that poor migrants and refugees from other countries are a threat to the peaceful life of the American people and send out a clear message to the world on what the original "country of migrants" now thinks on that issue.
In Florida, Governor Rick Scott, a Republican running for Senate, flooded TV with an ad promising to retain the protections for pre-existing conditions, even though Florida is one of the states involved in the lawsuit. Heidi Heitkamp as the most vulnerable incumbent.
But after their catastrophe of 2016, when Hillary Clinton was criticised for lacking a clear message to compete with "Make America great again", Democrats realised that a pure anti-Trump message would not be enough. In governors' races, Democrats have surprising opportunities in open seat contests in Kansas and South Dakota.
Among white college-educated women, Democrats enjoy a 28-point advantage: 61% to 33%.
Meantime, he also was asked how he will respond if Democrats win the House.
If ever there was an off-year election for younger voters to break tradition, this is it. The task for the GOP is ... daunting.
In Utah, get ready for a poll-close call that announces Mitt Romney, the 2012 Republican presidential nominee, as the next senator from Utah. The House is highly likely to change hands tonight. A lot of them are in Southern California, around Orange County. Trump tweeted last month: "Republicans will protect people with pre-existing conditions far better than the Dems!" Meanwhile, Democrats are fighting hard to take seats that have been held by Republicans in Arizona, Nevada, Texas, and Tennessee. Democrat and former speaker Nancy Pelosi serves as House minority leader.
Citizens began casting their votes early on Tuesday morning (around 9:00pm AEDT), following a divisive campaign marked by fierce clashes over race, immigration and other cultural issues. It's worth watching to see if a Democratic wave could even reach Alaska.