Third party defections endanger Democrats
2016 race threatens a repeat of past elections that progressives threw to the GOP
By 
THE GOP NOMINEE, a former entertainer whose presidential prospects were once ridiculed, gains in the polls with a not-so-subtle pitch to whites in the Rust Belt. His Democratic rival who survived a spirited challenge from the left is criticized as a career politician who doesn’t always connect well with voters. Meanwhile an obscure Republican launches(...)