DEMOCRATS HOPED TO RAISE $7 MILLION FROM ASIANS IN U.S.
Democratic National Committee records indicate John Huang, White House official and committee's leading fundraiser, helped devise strategy to raise unprecedented $7 million from Asian-Americans partly by offering rewards to largest donors, including special access to White House; suggest goal of raising funds created high-pressure atmosphere that led to at least $1.2 million in improper donations; show Huang told potential donors that time was ripe for them to win political clout that had eluded Asian-Americans for century, and that political contributions were path to power; photos (M)