Seems Patrick Ruffini has the MSM/DNC strategy all lined up.
It certainly seems to fit what is going on. In essence, they are going to try to get the GOP shooting at each other, hoping for nasty fights that leave plenty of hard feelings. It tends to work. In 2005-2006, there were nasty internecine fights among the GOP, and it caused some Republican voters to stay home, and others to flip, depending on the situation.
I dunno if it will work or not, but it may be their only shot.