This is the first of what will be a four part series looking at the political geography of the states in order to get a better idea of how each party does outside of just the presidential elections. I'll also compare Obama's 2008 electoral performance to an average of the 2004 and 2008 presidential elections as well as various statewide races since 2004 to understand which areas are more favorable or hostile to Democrats downballot. Additionally, for states that have precinct average data on DRA I've mapped out the states at that level, but for every state I've also mapped the county level political geography.
The first set of maps will detail the partisan Average PVI comparing each county or precinct to the state at large. The second set compares Obama's performance to the partisan average while controlling for the difference between Obama's numbers and the average statewide. Thus, if a county is more Democratic on average than the state, but Obama did worse than his statewide numbers, he would underperform. This gets somewhat distorted in states where Obama did significantly worse or better than average across the board, but is excellent in states where his statewide performance was similar.
All county level data is from Dave Leip's Atlas while all precinct level data was taken from Dave's Redistricting App. You can click on most of the maps for a larger image.