Cuomo's name recognition isn't as bad as you might think, if the last PPP national is anything to go by:
https://uselectionatlas.org/FORUM/index.php?topic=169084.msg3618192#msg3618192though it's possible that some of those with an opinion of Cuomo are old timers who assume that he's the same as his father. In any case, Christie's name recognition is well short of 100% as well, though presumably higher in PA than nationally.
In this poll, Christie loses to Clinton by 5, yet Quinnipiac's national poll has him losing nationally by 8:
https://uselectionatlas.org/FORUM/index.php?topic=170303.0So he's doing slightly better in PA than he is nationally. Not just against Clinton, but against Biden and Cuomo too.
I mean, look at Christie vs. Biden: nationally: Christie leads by 3; PA: Christie leads by 13.
Rubio and Ryan, meanwhile, do worse in PA than they do nationally. Is this just because Christie's name recognition is much higher in PA than nationally? Or would a Christie vs. X race involve a significant trend towards R when compared to Romney's showing in 2012?