Obama Exaggerating Claims On Charter Expansion Law?

Way way down in the Obama campaign response regarding bipartisanship you can see a couple of education-related entries (The Obama record on bipartisanship). 

Only problem is, I don't really remember Obama being involved with -- or credited for -- the charter school expansion that took place in 2003. 

I'll check with my Chicago people but this claim, at least, seems exaggerated.