Andrew Sullivan, in a conversation with Reagan Republican Bruce Bartlett (who was fired from his conservative Think-Tank job after writing a book highly critical of Bush) sheds light into why Bush's poll numbers will get no lower and why Bush's greatest loyalty is from Conservative Christians. This is highly insightful
From The Myth of Bush's Loyalty;
The key element that binds Christianism with Bush
Republicanism is fealty to patriarchal leadership. That's the institutional structure of the churches that are now the Republican base; and it's only natural that the fundamentalist psyche, which is rooted in obedience and
reverence for the inerrant pastor, should be transferred to the presidency. That's why I think Bush's ratings won't go much below 25 percent; because 25 percent is about the proportion of the electorate that is fundamentalist and
supports Bush for religious rather than political reasons. They are immune to empirical argument, because their thought-structure is not empirical; it is dogmatic. If the facts overwhelm them, they will simply argue that the "liberal media" is lying. Bruce poignantly thinks the GOP is still the secular, empirical, skeptical party it once was. It's not: it's a fundamentalist church with some huge bribes for business interests on the side, leveraged by massive
debts. So all criticism is disloyalty; and disloyalty is heresy. The facts don't matter. Obey the pastor. Or be damned.