Hmm...
I decided to look them up myself -
CONGRESS – Job Rating in national polls
The first column is .......date..app..disapp..unsure...+-
Ipsos/McClatchy...............2/6-9/09 37 59 * -22
CNN/Opinion Research........2/7-8/09 29 71 - -42
CBS.................................2/2-4/09 26 62 12 -36
FOX/Opinion Dynamics.....1/27-28/09 40 46 14 -6
FOX/Opinion Dynamics.....1/13-14/09 23 68 10 -45
NBC/Wall Street Journal....1/9-12/09 23 68 9 -45
USA Today/Gallup 1/9-11/09 19 76 5 -57
I must be looking at different data than you.
CNN/Opinion Research ..2/7-8/09.....29.....71.....-.....-42
CNN/Opinion Research 10/3-5/08.....23.....76.....1.....-53
with approval ratings consistently in the 20's over the last two polls I ail to see how suddenly the ratings are jumping into the 50's and 60's as in your poll by the same organization.