MARK MIDDLETON, a former White House aide, is alleged to have peddled his connections to the Democratic Party and PRESIDENT BILL CLINTON to set up his own foreign investment deals during trips to Asia in 1995. After leaving the White House, he was employed by STEVEN GREEN, who was starting a $240 million overseas investment fund through OPIC. Green, a crucial ally of Clinton's during his first run for president, has benefited from frequent overseas economic missions with OPIC and the Commerce Department. Did Middleton help Green finesse his OPIC deal? Or was he trying to elbow in on Green's success?