Nick Cohen writes today:

I learned it was one thing being called 'Cohen' if you went along with liberal orthodoxy, quite another when you pointed out liberal betrayals. Your argument could not be debated on its merits. There had to be a malign motive. You had to be in the pay of 'international' tycoons or 'neoconservatives'. You had to have bad blood. You had to be a Jew.

Normblog provides the context.