CTL, that type of reasoning might impress a jury but don’t try it in front of a judge. What does one have to do with the other? Moreover, he met Nancy after he and Jane Wyman had already filed for divorce (and according to Halacha once Noahides split up they are considered divorced). He was helping get her name of a list of Communists (she had been confused with another Nancy Davis). Anyway, Noahides are not subject to the cherem of Rabbenu Gershom so he did not do anything wrong. BTW, he and Jane remained friends and she supported his political campaigns.
In answer to the O.P.’s question, after they were mugged by reality they went to conservatives every one.