Best to make your criticisms in terms of specific failures on his part ~ rather than generalities. I think he did a great job bringing in Hollywood lesbian supporters ~ even Lindsay Lohan ~ somebody got a picture of her without bruises?
His handling of the NY 23rd congressional district (the Dede Scozzafava screwup) was enough to disqualify him forever, as far as I'm concerned. He took a formerly conservative district, did everything possible to bash the conservative who was winning it, and with Dede's help apparently has given it permanently to the Democrats, or at least until the tides shift.