Kevin Drum had this interesting chart today:

George Bush, with help from Karl Rove, Newt Gingrich and a host of others, have given a tutorial on how to destroy a political party.  Of course the Republicans aren't any deader than the Democrats have been at various times.  I suspect that Bush's continued implementation of a policy of national destruction is not going to help the current trends in the short run. 
Other Republicans have got to know what's happening and must begin a process of soul searching.  As I've written before, watching Republicans over the next two years is going to be great sport.  And a final thought.  The above trend is heartening in another way .... the perception that the Republican party is dominated by the religious right has got to be a large part of the party's soul search.  The fad of being a part of a fanatical approach to life seems to be wearing thin with some degree of sanity returning to the populace.
Hallelujah!