While Alan Dershowitz is a staunch liberal, he’s threatening to leave the Democratic Party should Rep. Keith Ellison become the next chairman for the national committee. Dershowitz, a renowned attorney and Israel supporter, said he would resign due to Ellison’s positions on the Israeli-Palestinian issue and his association with Louis Farrakhan : Speaking on Fox Business, Dershowitz said there is a divide in the Democratic Party over Jewish issues, particularly the support of Israel, or lack thereof, offered by the Obama administration.