"When did US politics become a series of contests about who is more openly pro-Israel?"

This is a good question. Much information can be found with a look at political zionism.

"There is no inconsistency between loyalty to America and loyalty to Jewry."
-Louis Brandeis
April 25, 1915

I am sure that some Zionists do not know Khazars stole the Jewish story. I just don't know how many real Jews are left.