Bill Clinton, freshly deployed Hillary Clinton campaigner, visited Stephen Colbert on CBS’s The Late Show last night to explain why Bernie Sanders is doing so well in polling, what’s up with Donald Trump, and for whom he will vote which yes, was a serious softball. But Lady Gaga, plugging the debut of FX’s American Horror Story: Hotel on NBC’s Tonight Show Starring Jay Leno, trumped Clinton in the ratings, with an assist from Jay Leno. “Who do you like for 2016?” Colbert…