The Rasmussen JA numbers are high compared to other polls and the horse race numbers low, so 55% would be a good number to aim at, which would translate to 51% or something like that for the other polls.
I don't know how many have noticed, but I was just over at Rasmussen, and when I see the internals, it does appear that he is overweighting Democrats by 3-4% not only in the horse race but in some state polls. For example, his newly released Iowa poll has Kerry up 3, HOWEVER, Bush gets 1% more R's than Kerry gets D's and they are tied on independents. I remember reading yesterday similar discrepancies in the horse race poll.