"September 11 changed everything." How often have we heard or thought that since that awful morning? Yet for 14 months, September 11 seemed to have changed very little in American politics; the nation's electorate still seemed split evenly between the parties, divided along cultural lines. But as the results of the 2002 elections came in, it became clear that something had indeed changed, as Republicans made down-the-line gains from the statehouses...