Roughly 3 in 4 American adults believe the upcoming presidential election is vital to the future of U.S. democracy, although which candidate they think poses the greater threat depends on their political leanings, according to a new poll. The survey from The Associated Press-NORC Center for Public Affairs Research finds that most Democrats, Republicans and independents see the election as “very important” or “extremely important” to democracy, while Democrats have a higher level of intensity...