One area of particular contention for the American presidential candidates this year will be in the suburbs of major urban areas. This was where Romney in particular was able to defeat his Republican rivals, but is also home to large number of potential Obama supporters. Given his likely support in cities, Romney will need to well in the suburbs this time around.
The Washington Post looks at how suburban counties voted over the past two elections.

Credit for the piece goes to Ted Mellnik, Laura Stanton, and Karen Yourish.