>> god bless alaska, god bless america. >> mitchell: tonight sarah palin officially steps down as alaska's governor while giving few clues about her future political plans. i'm russ mitchell. also tonight, the stock market rebound. is it a signal of recovery or too good to last? the problem of america's underinsured, how medical bills can bankrupt families even though they have health insurance. >> i've got about $80,000 of bills right now. and they're still coming in. >> and numbers game. a look at the new technology that watches fielders and base runners tracking every move they ma...