A controversial Chinese-American businessman embroiled in the much-investigated 1996 fundraising scandal has re-emerged as a donor to three Democratic presidential campaigns. Campaign records filed with the Federal Election Commission show that George Chao-chi Chu, of San Francisco, contributed $2,000 each to the campaigns of Sens. John Kerry (D-Mass.) and Bob Graham (D-Fla.), and $1,000 to that of Rep. Dick Gephardt (D-Mo.). Chu had been one of the Democratic Party’s top fundraisers at a time when so-called soft-money contributions were still legal, raising more than $500,000 before the scandal hit in 1997. He also raised eyebrows because of his links to...