Brighten Godfrey combs through more than 21 years of U.S. Senate roll call votes and finds empirical proof behind the "party of no" strategy pursued by Republicans.
Divisiveness is measured as the average distance between Republicans and Democrats. For example, if 50% of Democrats and 50% of Republicans vote "yes," then divisiveness is 0. If 10% of Democrats and 90% of Republicans vote yes, then divisiveness is 80%.
The historical data shows divisiveness didn't move much for about 18 years, but then dramatically spiked since the beginning of the Obama administration, setting a record in 2009 and another record so far in 2010. The difference here is dramatic: 29% divisiveness in 1989, vs. 70% today.
Also interesting: The three sitting senators who have voted "no" the most: Sen. James DeMint (R-SC), Sen. Tom Coburn (R-OK), and Sen. George LeMieux (R-FL).