Right now even with the terrible optics she’s still the presumed nominee and benefits from that at the polls. Once there is one candidate opposing her (with the notable exception of Bush who will have the exact same problems as she does in motivating people)she won’t look as good in the polls.
Because Hillary has their nomination in the bag, you can bank on it that Dems will turn out to vote for Jeb Bush in the open GOP primaries, which is fine with the GOPe, of course. Then, with the first stumble in Jeb’s campaign, they are all set to repeat old Ma Richard’s famous line, with Jeb’s name instead of his dad’s: “ Poor.Jeb...he can’t hep it. He was born with a silver foot in his mouth.” I can hear Hillary drawling it in her fake southern accent.