BUSH IN FREE FALL

Down to 31%.

Bush's fall is being fueled by erosion among support from conservatives and Republicans. In the poll, 52% of conservatives and 68% of Republicans approved of the job he is doing. Both are record lows among those groups.

Moderates gave him an approval rating of 28%, liberals of 7%.

"You hear people say he has a hard core that will never desert him, and that has been the case for most of the administration," says Charles Franklin, a political scientist at the University of Wisconsin who studies presidential approval ratings. "But for the last few months, we started to see that hard core seriously erode in support."

Tags: Bush approval ratings 31%, USA Today/Gallup poll