Obama not quite so innocent?

We are hearing quite a lot about the Clintons playing dirty in the US primary elections. This consists mostly of Bill calling into question Obama's record of opposition to the Iraq war. This suggests that the Obamas can play hard-ball also:

http://youtube.com/watch?v=sN1qZMBE9Gc

And this, quite amusing, is classic negative campaigning:

http://youtube.com/watch?v=6h3G-lMZxjo