I ran across a a really great article today on Big Hollywood. I, too, have wondered in the past few weeks why the Left is so focused on Sarah Palin, even with the election well in our past. I believe this may be a very good explanation: (emphasis my me)
My first thought was that it tied heavily to her appearance. In liberals' minds, conservatives are supposed to look like the couple from the painting American Gothic: Dour and joyless, aged, spartan and frail. Political leaders aren't supposed to be young, really good-looking women, full of energy, smiles, and winks.
She is the embodiment of the anti-choice, the opposite of every choice that lefty elites have ever made — as to going back home instead of moving to the west coast, having children, having a child with Down's, staying married to one man the whole time, choosing rural or suburban over urban and living a generally conservative lifestyle, working with her hands . . .she is is the antithesis of everything that liberal urban elites are, so it's not just enough to say, 'I disagree with you,'; she has to be repudiated and crushed.
...the seeming happiness of Palin's life is a 24-7 irritant because it challenges the way some liberals see the world.
In her opponents' minds, Palin's made all the wrong choices, and cannot, they insist, be very bright. Yet she's happy and successful. She is an anomaly that invalidates their worldview,and for that, they attempt to immiserate her — regardless of whether she wishes to run for national office again.