DETROIT — Democratic presidential candidate Howard Dean of Vermont supports a two-state solution with Israelis and Palestinians living side by side, but says a comprehensive peace plan will only come through sacrifice and commitment by the leadership on both sides. An American president brokering such a deal would go a long way toward improving U.S.-Arab relations, Dean told about 200 people on the second day of the Arab American Institute’s National Leadership Conference on Saturday. The former Vermont governor said the U.S. needs to help build economic opportunity in the West Bank, and both sides must learn they can be...