I don't know, is this too tentative?

Dear Senator Biden:

You may speak for MBNA but you don’t speak for me when you go after fellow Democrats in public. Next time you have a beef with Howard Dean, kindly address it in private so that you don’t give AMMUNITION TO THE OTHER SIDE. COULD YOU DO THAT FOR US, PLEASE?

Then, with the air time you aren’t using to betray 58 million Democratic voters, you could go after the band of criminals bent on DESTROYING OUR COUNTRY.

Excuse me for shouting but I had to assume you are deaf to the average voter.

Great rant here by William Rivers Pitt.