Warren Spending More Than Brown In U.S. Senate Race

In the U.S. Senate race between Republican incumbent Sen. Scott Brown and Democratic challenger Elizabeth Warren, Warren is spending money faster than Brown.

Warren spent $13 million from Aug. 18 through the end of September, while Brown spent nearly $9 million, according to the latest Federal Election Commission filings. The majority of the money for both candidates is going to TV, radio, print and online advertising.

The second-biggest expense for both is consulting. In this race, each candidate has spent more than $100,000 on voter research, including micro-targeting to learn more about voters.

With less than three weeks to go before the election, Warren has about $7 million on hand, after raising $36 million in the race so far. Brown has $10 million left, of the total $25 million he's raised. But really they are about even, because, according to the Warren campaign, she has prepaid $3 million in TV advertising to run through the election.

This race is the most expensive congressional race in the country.