They also have to factor $$$$ into it, which is why it was so tough for them this week, when it should have been a no-brainer - after all, their base simply HATES JEWS, and Jews won’t come at you with bombs if you anger them. So dump the Jews.
But should Jewish money dry up, the party is simply finished...hence the mess they had.
Not just money. A lot of the activists who organize for the Democrats have been Jewish. Especially the people from the Bernie Sanders campaign. If they #WalkAway, then that's even more trouble.