[Alberta's Child]

Most modern Jews worship the State. A society built on individual freedom without a massive nanny-state to manage people's lives is completely alien to them.

It's really that simple, folks.

[TexasM1A]

Many also are linked with socialist/communist ideas/thoughts.
The natural place for them to be is the CPUSA, but since they have very little influence, the Democrat party is a natural fit.
They have been able to radicalize it in a relatively short amount of time.