He’s going after he on a number of levels, but his attacks against Mark Penn are likely to be effective.

I’ve previously mentioned his financial ties to union buster, but now Edwards is pounding on Penn’s ties to Blackwater

Mark Penn is the worldwide president and CEO of Burson-Marsteller. The firm’s lobbying subsidiary BKSH helped Blackwater’s top executive, Erik Prince, prepare for his congressional testimony this week.

I believe that both Obama and Edwards have held off attacking because they feel that the other will be the primary recipient of the benefits, and that Edwards has concluded that it’s time to take the gloves off.

Good.

Penn is pond scum, and making him an albatross around Hillary’s neck will either hurt Hillary, or get Penn out of the campaign, both of which are positive actions.