Senator Scott Brown has a new piece of evidence to bolster his argument that he is more than willing to cross party lines in the Senate.

Brown, a Republican who is locked in a tough reelection battle with Democrat Elizabeth Warren, is pointing to an analysis that found that, when the parties have split in the Senate, he has voted with Democrats 53 percent of the time since January 2011.

The analysis, based on data from Bloomberg Government, is just one of several surveys that have attempted to quantify how frequently Brown and others cross the aisle.