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Less than three hours before SC polls closed on Tuesday in the state's primary elections, President Donald Trump fired off a series of insults against Republican Rep. Mark Sanford and endorsed his GOP opponent, state Rep.

Trump also tweeted his endorsement of Adam Laxalt, Nevada's attorney general, just after noon Pacific time. He will be a great Governor. He carefully rebuilt his reputation after his affair was revealed and won a seat in the House of Representatives.

Sen. Heidi Heitkamp, D-N.D., does not have a primary challenger, and Sen.

Here's a guide of things to watch for in Tuesday's primaries.

Democrats are also on a long winning streak in Virginia.

Finally, in Virginia's 4th Congressional District, incumbent Donald McEachin is running unopposed in the Democratic primary. Geoffrey Skelley of Larry Sabato's Crystal Ball writes, "Comstock is a prodigious fundraiser and has a history of outpacing the partisan lean of districts she has represented, but the district's Democratic shifts in 2016 and 2017 show why she is one of the Democrats' foremost targets in 2018".

Paul Pelletier, another Democratic candidate in the race who spent 27 years as a prosecutor, has taken a similar position, telling his hometown paper in MA that "there's enough evidence for the House to investigate". He will not appear on Tuesday's primary ballot since he is the only Republican candidate running for the position.

Similarly Rep. Barbara Comstock of the 10th congressional district in the Washington suburbs, often depicted as a GOP moderate, faces fierce primary opposition from a right-wing underdog named Shak Hill.

U.S. House - Virginia 10th District: Northern Virginians will be watching closely as Incumbent-Rep.

While they have focused their campaigns on health care, gun control and the GOP tax law - along with Comstock's record of largely voting in line with Trump - the Democrats, in interviews with ABC News, differentiated themselves with various ideas about on how to best challenge the president and hold him accountable. Wittman is running for reelection and is on the republican ballot for this primary. Dean Heller. And in North Dakota, Republicans will pick Rep. Kevin Cramer to challenge Democratic Sen. That's in contrast to the last midterm election in 2014, when the state Republican early turnout was 43% higher than for Democrats.

Three Democratic candidates are vying for their party's nomination - Phil Noble, James Smith and Marguerite Willis.

In the 6th District, voters are deciding the Democratic nominee to face off with GOP nominee Ben Cline. National Republicans have weighed in on the race, with Sen. Stewart is the chairman of the Prince William County board of supervisors and is a conservative who has backing from former White House Chief Strategist Steve Bannon.

Tuesday's elections in ME are notable not so much because of who's running but because of how the election itself will unfold.

Democrats will decide between Elaine Luria and Karen Mallard. He faces a field of candidates that also includes state treasurer Dan Schwartz.