Democrat Mark Green conceded to Republican Michael Bloomberg in a cliffhanger race Tuesday for mayor of New York City, still reeling from the Sept. 11 terror attack. Democrats captured governorships in Virginia and New Jersey, breaking eight years of GOP control in each state.

Green's concession put Bloomberg in position to succeed Rudolph Giuliani, a Republican barred from seeking a third term.

Green, the city's elected public advocate, spent about $12 million on his campaign, while Bloomberg, the billionaire owner of the Bloomberg financial information company, was expected to spend more than $50 million of his own money. That made it the most expensive mayoral campaign in U.S. history, according to Common Cause, a citizen lobbying group.