Simple actually. When a liberal doesn't have a point to make or is losing an arguement, one of the points they can fall back on is that Republicans blame Clinton for everything. Even though, that's really not true. There is just so much to blame on Clinton that it seems that way.
Fast-forward about 4 years from now and we'll see the Dems pulling the same thing on Bush. Not everything will be Bush's fault, but there will be so much that was it will appear that way as well.
Pretty pathetic actually. Even more pathetic is that people like Joey Balls eat it up and don't realize how stupid they sound.