In the 1964 elections, he was elected as a Democrat to the 89th United States Congress and was re-elected twice in 1966 and 1968. After the 1964 run, Ottinger was criticized for using a loophole in election laws to spend $193,000 of his own money to get around a limit of $8,000 in the race. He set up multiple committees and gave money of all of them. Most prominently, Ottinger's mother, Louise, and sister, Patricia Heath, had set up 22 different committees that in turn donated $6,000 apiece to his campaign.