How do you know they are terrible? Do you know the final election results? My guess is they'll be incredibly close to the final numbers.
Unlike the opinion you just expressed, the vast majority of libtards here dislike RCP and think it's innacurate...until it shows Obama in a positive light... then it's spot on.
I haven't seen too many liberals stating a dislike for RCP. Some have stated that it leans right, I do know that the founders are conservatives. I've seen quite a few cons decrying it as well.
I think all of the aggregation sites have positives and negatives except for unskewedpolls, that site only has negatives.