Battered wife syndrome, on display.
You make a good point. It is true that Gallup found in 2008 that single WHITE women (single, divorced, separated or widowed) voted OVERWHELMINGLY for Obama.
Obama now has a 12 point gender gap and much of this is due to how single white women plan to vote for. They also make for a significant part of the middle class: Unemployed, ugly-looking single women, plaintiffs in sexual harassment suits, union types (NEA, SEIU etc), GLTB, NARAL etc.
What is it with single WHITE women?