Palin's gradual downward trend in popularity:
http://www.washingtonpost.com/wp-srv/politics/polls/postpoll_021010.html?sid=ST2010021100035c. Sarah Palin
------- Favorable ------- ------ Unfavorable ------ No
NET Strongly Somewhat NET Somewhat Strongly opinion
2/8/10 37 18 20 55 16 38 8
11/15/09 43 20 23 52 18 34 5
7/18/09 40 20 20 53 19 34 7
10/23/08 LV 46 28 18 51 11 40 3
9/29/08 RV 51 29 23 40 11 29 9
9/22/08 RV 52 31 21 38 10 27 11
9/7/08 RV 58 35 23 28 11 17 15
9/4/08* RV 52 34 18 37 14 23 11
Interestingly, the poll also has the GOP doing the best it's done in the generic congressional matchup since 2002, and the Democratic Party has its lowest favorability ratings in decades.