Joe Biden:  "remind our base constituency to stop whining and get out there and look at the alternatives. This president has done an incredible job. He's kept his promises." 

Thanks Joe... let me reinterpret what you just said...

"Hey, Progressive base that got us here... FUCK YOU!!!!!!  WHO ELSE ARE YOU GOING TO VOTE FOR?!?!!?  Sarah Fucking Palin???   Look over there at Sarah Palin.. she is crazy!  Look over there at Christine ODonnell!  what a looney!!!  What are you going to do about our limp dick "support" of the public option?  What are you going to do about not closing guantanamo?  What are you going to do about Obama claiming executive assassination powers for US citizens?  What are you going to do about Obama not killing don't ask don't tell with an executive order? What are you going to do about the status quo continuing in our infinite wars? What are you going to do about Obama DOJ actively pursuing and in many cases expanding attacks on civil liberties?  Are you going to vote Republican... cause that would be crazy.. those guys are wackos!!! You must be on drugs to even consider not voting for us even though we only give lip service to your agenda."

Hmmmm.... I wonder why there is an enthusiasm gap?  I dont see a lot to get enthused about... 

p.s. Here is someone more artfully describing the same thing as above