You'll find alot of congress critters with this kind of record. If you want to be a successful sponsor of legislation that actually gets passed, you have to work to get into the leadership of your party, and only a few will actually accomplish that.
Otherwise, the other accomplishment you can do is to give access to the legislative process to voices and groups that otherwise might not have that access. You can get on the committees, you can pass information back and forth, you can get people to testify before committees, and you can write legislation elements and get them before the people that assemble the legislation.
What we lost with Kucinich and Grayson, and Feingold is people who would act as that conduit into legislation. That we will miss.
Obama didn't go to Kucinich's district to campaign for HCR by accident. He knew Dennis' value in the larger process.