To a certain degree, he needs to stay "above the fray".
Cheney, Frist, Hastert, Powell, and Rice (where is she lately anyway???) need to do this, and they've been woefully inept and ineffective...
Remember lunatic Al Gore? The one good thing he did for Clinton was being an excellent attack dog, defending him aggressively at every turn... Where's Cheney???
Believe our party is resting up for a stronger push in September. It's summer vacation time and people are being pulled in different directions. June 30 is a critical date as well. Let's see how things play out in July/August and drop the hammers in September.
In a word, Condoleeza. Not exactly an attack dog but she has been great at taking on the press.