Even though floor votes indicate a considerable degree of unity on the macro level, clear trends are evident in individual voting patterns—trends that shed light on party unity and cohesion, ideological fervor, and the personal predilections of individual Senators.
A political observer might postulate that, on the whole, the Democratic Party is currently the more unified, and the data in the Senate of Virginia bear that out. Seventeen (of 20) Democrats voted with the average member of their party at least 98% of the time, a threshold not cleared by a single Republican.
The average Republican voted with the majority of his or her party 96.6% of the time, compared to 98.3% for Democrats. Only three Democrats voted with their average party colleague less than 98% of the time: Petersen (96.4%), Deeds (96.2%), and Lewis (95.6%).