You almost had it, Jonah.  You had the key piece right here: "By far, the delegates — and pundits — most excited by the relentless mantra about the First Woman President were aging white liberal baby boomers."

 Not just the liberals, but boomer women across the ideological spectrum.  Many conservative women see Trump as below the Zika virus too.  And while they wouldn't normally vote for a dem, they'll go with Hillary because she's a woman.  Clinton wins if she can bring in a portion of that electorate.