The NYTimes has this interesting look at Tuesday's presidential election results compared to 2004. The redder the area, the more people shifted towards Republicans. The bluer the area, the more people shifted towards the Democrats.
The map is interactive on the NYTimes site, allowing viewers to see national, state and county level shifts between 2008 and 2004 (as well as three presidential elections). Click here and here for the maps.
What's evident in viewing the maps is how red (i.e., Republican) the country was when Bill Clinton first won election in 1992; and how dramatically America shifted bluer during George W. Bush's 8 years in office.
With the exception of the deep South, the movement towards the Democrats since 1992 are striking and unbroken. Yet, Bush and Cheney won in 2000 and 2004.