Polls have closed in South Carolina, which along with Maine, Nebraska and North Dakota are holding primary elections on Tuesday.One week after President Donald Trump's endorsement-winning streak in high-profile Republican primaries was snapped, the president's immense clout over his party is facing another key test in South Carolina's GOP gubernatorial and Senate nomination races.But the race grabbing the biggest national spotlight is in Maine, where it's judgment day for Graham Platner, the embattled Democratic Senate candidate in left-leaning Maine who is aiming to oust longtime Republican S...
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