I've never seen him reference him, but then again I only watch a few nbc clips online since I don't have a TV. Silver pretty much makes what Todd does extinct, so I'd imagine Todd wouldn't willingly put any focus on the 538 model.
The right's Silver obsession has been a marvel to watch. I think some genuinely don't trust him, but I kind of see something else happening here. I think we're seeing a level of willful ignorance in terms of how many conservatives view this election. I think we're seeing a further setting of the stage for massive voter fraud charges and potential incitement. The narrative right now is that Romney still has momentum, he's being optimistic because he's going to win, Obama is desperate, he has no chance, etc. State polls don't reflect that, at all though. Still, the right's general state argument is that national polls will dictate what happens - ie the challenger will get all the undecided voters and win nearly every swing state. The Kosmo argument, basically.
Silver is the only notable guy arguing against the "Romney momentum" theory, and suggesting Obama will win handily; sure Wang/PEC is too, but he's not nearly as visible as Silver has become. By smearing him as an Obama partisan, republicans can dismiss his shit - even if he's right on November 6th - and claim "no polls" showed Obama would win, therefore something fishy happened.