She will not have any political capital to extend in the first place. If she gets elected (disclosure: I placed an actual bet on Trump at 1/3), she will do it by the scruff of the neck, with very low turnout and only because responsible people will hold their nose and vote for “not Trump”. There will not be any Dem wave, whereas Trump does have large coat-tails that can be exploited (something GOP operatives on the ground have accepted by now, hence the truce).
So, in theory, from a progressive/liberal perspective, she will start as a weak and unpopular president facing an adversarial Congress. This will suit her perfectly though, because clintonites love to triangulate against their left flank. I can write her campaign speeches for 2020 right now: “We wanted this and that, but we had to settle for {terrible right-wing compromise which is even worse than previous status-quo} because of them ugly Republicans”.
President Sanders could start as a blank slate, but would have some intensity behind him, some momentum; he’d be first non-party President since whenever, a good ol’ underdog story to milk for months in the press, stuff that generates political capital. Despite her most strenuous attempts, Clinton will not have any of that; she will not be “the first female president”, but rather another political operative who wormed and fundraised their way to the Oval Office, someone half the country actively hates and the other half mostly tolerates while secretly dreaming about her husband.
Anyway, none of this matters, because you’ll get President Trump (and I’ll make a few quid). Like Robin Williams said in his French Smoker skit where he handed a cigarette to a kid, “suck on this cigarette, my baby! Life is shit, get to know this!”