If the GOP can't beat a ticket with Hillary at the top, it can't win. It is not like Obama is going to attract new voters to the Democrats. Democrats already get 95% of the black vote and most heavily black districts already get about 200% turnout.
There are LOTS of women out there who will vote for Hillary JUST because she is a woman and they think “the time is right for a woman President”. They’ll do this not knowing or caring what a truly horrible, dangerous person she is.