(Boston, MA) -- The U.S. Senate race in Massachusetts is not only one of the most closely watched in the nation, it's also turning out to be the most expensive.
Campaign donations in the contest between GOP incumbent Sen. Scott Brown and chief Democratic rival Elizabeth Warren have already topped $30 million, with Election Day still more than six months away.
A review of Federal Election Commission records by The Associated Press found the next most expensive race was in Texas, which includes a crowded Republican primary. Donations in the Texas race have neared $28.5 million.
The state with the third most expensive race in terms of total donations is Florida, where candidates have collectively pulled in more than $17 million.
Brown and Warren have signed a pledge limiting advertising by third-party groups.