http://www.msnbc.msn.com/id/12729893/

WASHINGTON - Disaffection over spending and immigration have caused conservatives to take flight from President Bush and the Republican Congress at a rapid pace in recent weeks, sending Bush's approval ratings to record lows and presenting a new threat to the GOP's 12-year reign on Capitol Hill, according to White House officials, lawmakers and new polling data.

Bush and Congress have suffered a decline in support from almost every part of the conservative coalition over the past year, a trend that has accelerated with alarming implications for Bush's governing strategy.

The Gallup polling organization recorded a 13-percentage-point drop in Republican support for Bush in the past couple of weeks. These usually reliable voters are telling pollsters and lawmakers they are fed up with what they see as out-of-control spending by Washington and, more generally, an abandonment of core conservative principles.