And Sobran's saying that there's a powerful Jewish contingent in American politics that uses its victim status to augment its power. He may be right or wrong about that assessment, but there's nothing "prejudicial" about making that claim.
My point, in other words, is that either certain statements are racist by their nature, or they're not racist by their nature. If they are, then they're racist no matter what specific group name you insert into the statements.
Two statements
A negligible number of Jews died in the holocaust; anyone who says otherwise has an axe to grind
A negligible number of Arabs died in the holocaust; anyone who says otherwise has an axe to grind
Are the two statements equivalent? Of course not; the first is false and marks you as a Holocaust-denier; the second is true. Similarly, Sobran's statements, which are rather hysterical with respect to Israel, might not be hysterical if applied, say to Saudi Arabia.