Conservatives in the United States, in general, are pro-Israel. When someone in their ranks even is slightly not pro-Israel they tend to throw them out i.e. Buchanan and Duke were forced out of the Republican Party and unto third-party candidacies.
OTOH, Liberals are less pro-Israel and even fully accept anti-semites in their ranks, like Al Sharpton, Jesse Jackson, Cynthia McKinney, etc.