Cartogram of the US House of Representatives election 2010:
Each of the 435 congressional districts is rescaled to have the same area. The white districts are too close to call (8 Nov 2010) or do not send voting delegates to the House (Washington DC). A comparison with the 2008 cartogram reveals not only that the Republicans made gains, but also where these occured. The next cartogram shows those districts that have changed parties.
Together with the elections of new representatives, 37 senate seats were up for election.
Cartogram of new senators elected in 2010:
All states are equally large except New York which is twice as big because there were two senate races in 2010 (both won by Democrats). White states either had no senate race in 2010 or were too close to call (8 Nov 2010). The Republican candidate in South Dakota, John Thune, ran unopposed.
Cartogram of the senate after the 2010 election:
In this cartogram all states are equally large because all states have two senators. (Exception: DC is not represented in the US senate, but I left it as a white spot on the map for your orientation.) The 2010 result in Alaska is still unknown because 41% of the votes went to write-in candidates, therefore you see white stripes in Alaska. A comparison with the previous senate shows the increased number of states whose senators come from two different parties. Especially in the middle of the country, there is now a connected region from north to south with mixed Democratic-Republican representation in the senate.