Congressional Vote Retention

There are always less congressional votes than Presidential votes in any Presidential election, since some people who vote in a Presidential race don't vote in a congressional race.

Here are the percentages of each party's Presidential candidate's votes for each party's congressional candidates since 2000.

Democrats:
2000: 91.0%
2004: 89.4%
2008: 93.9%
2012: 90.5%

Republicans:
2000: 92.7%
2004: 89.8%
2008: 87.1%
2012: 95.6%

Republicans showed the best Presidential retention in any election since 2000.