I'm not sure who Rasmussen has been polling since the election. Perhaps they were only polling Bush's "base" to keep him above 40%. Since the election, their daily poll has even shown Bush gaining approval!
But it finally happened today! Bush approval drops to 39%, with only 18% strongly approving and 21% somewhat approving! The big news here? The disapproval rating is at 60% with 43% strongly disapproving and 17% somewhat disapproving