This is the logic that drove her nomination as V.P. last time. All those silly little girlios who voted for Hillary, will automatically become Republicans because Sarah is a girlio too! Everbody knows that those silly little empty headed gals will go for Sarah! They don't care about issues.
Wrong.
As more and more women are choosing the Republicans over the Democrats, the Dems see one of their main support groups slowly slipping away because of choice, and can not afford for a woman to gain high office on the Republican side first. It would send a message that the Dems are not the only party that cares about women.