I mean they are only two percent of the population and as a whole they go 70-30 democrat so jewish republicans are a statistically negligible number. But as far as influence goes, it's another story.
I'd always thought that jewish republicans tended to be moderate or liberal rockefeller republicans not unlike jacob javits. Historically that's always been the case. But maybe in the past two or three decades you've seen a subset of them that are super far right and are indistinguishable from your catholic or protestant religious right type. Think Josh Hammer, Dave Reaboi and even the Hollywood crowd (Breitbart, Prager, Milius, Miller).
Like what is going on here. Is this the influence of the chabad/rebbe movement which are more militant/far right?
This was more specifically a NYC phenomenon. Some Jews didn't approve of or were excluded from the local Democratic Party's 20th century machine politics.
But in most parts the country apart from the South, the Republican Party was the party for "regular" Protestant people and the Democratic Party was implicitly for "other" people who were different in some way (Catholic, Jewish, "ethnic", etc).
I’d also argue that even in New York Jewish liberal Republicans like Javitz were pretty rare. The Rockefeller Republicans were mostly WASPish and fairly well to do business oriented liberals but Jews, including Jews of the same economic strata and with identical views still tended to vote Democrat. It’s more likely in the postwar era that upwardly mobile suburban Catholics would have become Rockefeller Republicans actually.
