Mr. Florio, who has 45 days to act on the bill, said he will veto it and seek to put the issue before voters in a non-binding referendum. Mr. Florio, a Democrat elected in 1989, considered New Jersey's law one of his crowning achievements. Republicans who won control of the Legislature in 1991 have been undoing many of the laws passed during his first two years, including large tax increases. Overriding a veto requires 27 votes in the Senate and 54 in the Assembly.