Oh, agreed. Though the correlation between Jewish descent and radical leftism is and has been very strong for well over a century.
While it’s stupid to think there’s a direct genetic link, it’s not unreasonable to consider the possibility there might be a genetic predisposition to ways of thinking that predispose to leftism.
Obviously the primary causation is environmental. Tom Sowell has some excellent discussion. Radical leftism is common to all middleman minorities around the world, despite the fact that leftism is by no means always in their economic interest.
A genetic predispostion to thinking a certain way. How would that occur? And Ashkenazi Jews in the UK tend to vote Conservative:
“But in the 2010 election, Muslims favoured Labour, while the Jewish vote went to the Conservatives.”
http://www.bbc.co.uk/news/uk-25889828
In the US, I think an awful lot has to do with some misplaced loyalty to FDR, a man who in reality betrayed Jews in the worst possible way, and was in fact an anti-Semite of the country club variety.