I think a bigger problem with the study is illustrated in how they gave a score on each piece of legislation in the first place:

"For each piece of legislation that affected troops, veterans or military families, IAVA took a position either in support of, or in opposition to its passage. The letter grades were derived from the percentage of times that each legislator's vote matched the official IAVA stance."
(http://iava.org/index.php?option=com_content&task=view&id=2056&Itemid=214)

They claim to be non=partisan, but we really have to take their word for it, don't we? IF the IAVA thought a given bill should have passed and a given senator voted against it, then that senator got a zero score for that bill.

Short of reviewing each and every bill, how can we tell *what* that really means, short of "here's a list of scores that show how much a senator agreed with the IAVA with what bills we, the IAVA, claim to be military bills in the first place.

In short, it means nothing. But it makes for good election-cycle politcs, no? ;-)