I'm not familiar with this site, but I think it makes sense to link to the full list of promises instead of just the "broken" promises. http://www.politifact.com/truth-o-meter/promises/obameter/
This view of the data shows the promises that were judge to be kept or compromised.
I think I agree with +victor steinbok
on this....much of the potential progress that Obama and the Democrats could have brought us has been blocked by the Republicans in the House and Republican filibusters in the Senate.
Incidentally, the same site shows that Republicans haven't exactly kept all their promises either: http://www.politifact.com/truth-o-meter/promises/gop-pledge-o-meter/
I believe we need to recognize the successes and failures of our politicians instead of always focusing on the negative. If we had more Senators as thoughtful as Warren, we'd go much further as a nation.