Top 4 Reasons Sarah Palin Makes Me Nervous:
1) She has a 3-month-old son. Even as someone who believes parenting and bread-winning responsibilities can and should be split between both parents, I would think that -- for the good of both her child and the country -- she shouldn't have to split her time between two fairly demanding and incredibly important roles.
2) Her 3-month-old son has Down's syndrome. See above. Multiplied by 100.
3) She supports drilling in wildlife refuges. More or less shoving cute baby polar bears aside in order to get more environment-ruining, progress-stifling fossil fuels.
4) She is pro-life even in cases of rape and incest. To whatever degree it would be a landmark victory for women if she was elected, it may also be a landmark defeat for women's rights.

One Sort Of Middling reason Sarah Palin Makes Me Nervous:
She looks like Tina Fey. Who I like and don't want sullied.