Rep. Chris Pappas on Tuesday won the Democratic Senate nomination in swing state New Hampshire, in a key race that is a must-hold for the Democrats in the midterm elections.Pappas defeated socialist rival and first-time candidate Karishma Manzur, the Associated Press reports, in the showdown to succeed retiring longtime Democratic Sen. Jeanne Shaheen, the first woman in the nation's history elected governor and senator.Republicans haven't won a Senate election in New Hampshire in 16 years, but they view the open Democrat-held seat as a top flip opportunity in the fight to hold their slim major...