Unless you agree that Israel should massacre Palestinians (and probably all other non-Europeans) in Israel, the center of the United States’ Democratic Party basically considers you out of kilter and your misalignment at odds with the power of the Party, and American foreign policy. You are then described as a radical, and further as a leftist, and your political position classified as socialist. Such branding will kill national party financial and people support if you happen to be a Democratic Party candidate for a national office.