A Pew Research Center poll has found that a majority — 63% — of American voters find Donald Trump and Joe Biden “embarrassing” presidential candidates. In additon, a third or more of each candidate’s supporters — 37% of Biden supporters and 33% of Trump supporters — say their own candidate is embarrassing. A hefty 87% of those survey said the presidential campaign does not make them “proud” of the nation, with 68% saying the contest is too negative. Yet 44% would vote for Trump at this stage, while only 40% would vote for Biden, and 15% would choose Robert Kennedy Jr., according to the poll, w…