If she's worried about splitting the vote, then she should get behind Sarah and push with all her might, but that's not what she's doing. She's undermining her, when she could be helping to ensure Sarah's victory, by convincing some doubters out there to give Sarah a closer look.
Instead, she's repeatedly championed Chris Christie for president, although he's got far less chance of becoming the nominee, or of beating Obama. Why?
It’s a mystery to me too.