Maybe in 20-30 years, this could happen (we're seeing the Jewish move to the right abroad, in Canada and France -- and Israel, I suppose), but Jews will vote >60%, maybe >70% for Democratic Party candidates in 2014. Notwithstanding contrarians like me.
Even if the Republicans did end up with a majority of the Jewish vote, how much would it really mean?
It could tip the balance in close races. Every vote matters and whatnot.
Don't the majority of American Jews live in solidly Democratic urban/metropolitan regions, anyway?
It could help a bit in Florida, I suppose.