Democratic presidential hopeful Bernie Sanders put in a guest appearance on tonight’s Larry David-hosted Saturday Night Live. First came a sketch that featured David reprising as Sanders on the campaign trail but morphing back into Cranky Larry (he refuses to shake the hand of a voter who’s just coughed into it, for one). That was followed by a seaborne bit in which David played the captain of a sinking ship who’s reluctant to let women and children board lifeboats…