For those of you thinking that Obama didn't cosponsor or sponsor anything in 2005 and therefore I can not hold my previous points against him...
Here's proof he did in fact participate during 2005.
S.1197
Title: A bill to reauthorize the Violence Against Women Act of 1994.
Sponsor:
Sen Biden, Joseph R., Jr. [DE] (introduced 6/8/2005)
Both Clinton and Obama are cosponsors on this bill.