With control of the U.S. Senate hanging in the balance this November, candidates across the country have been trading blows on debate stages, delivering everything from explosive personal accusations to embarrassing gaffes and unexpected admissions.The heated exchanges have unfolded in closely watched general-election contests and contentious primaries alike, offering voters a glimpse of the personalities and policy differences shaping the battle for Washington.Some confrontations have drawn national headlines, while others produced memorable moments that quickly spread across social media.12...