Locked in the nation’s most expensive US Senate race, Senator Scott Brown and Democratic challenger Elizabeth Warren both revealed shrinking campaign coffers late Thursday night, with about $3.7 million left for the Republican candidate and $3.5 million left for the Democrat.
The latest reports covered fund-raising between Oct. 1 and Oct. 17. Warren, who has outraised Brown in every reporting period, raised $2.5 million in the first half of October. Brown, who is also among the nation’s leading fund-raisers, collected $1.6 million over that period.
But in the final weeks of the campaign, both candidates are spending far more than they are taking in, hoping to close out the tight election with a blitz of ads. Brown reported spending $8.3 million in just over two weeks’ time, while Warren reported spending $6.3 million.
The candidates have been a constant presence on television. Warren, since entering the race last year, has raised $38.8 million. Brown has raised about $29 million since he took office in January 2010. In addition, he has carried over $7 million from his 2010 special election. Total it all up and it’s about $75 million.
Both candidates have large staffs and have spent millions of dollars on polling, consultants, yard signs, food, and any other necessities of a modern campaign.
Much of Warren’s money has come through online fund-raising from a national network of left-leaning donors who see her as standard-bearer for her party’s liberal wing. She is also raising money from women’s groups and party activists who see the seat as critical to control of the Senate.
Brown is also being helped by the high-profile nature of the race. Many Republicans saw his 2010 special election victory — in a Democratic stronghold for a seat long held by Edward M. Kennedy — as the beginning of a resurgence that helped lead the party to rebound in the 2010 midterm elections.
The race has remained close for most of the past year, though more recent polls show a potential slight edge for Warren.
New reports on the FEC website from New England’s most expensive House race indicated that US Representative John Tierney spent feverishly between Oct. 1 and Oct. 17 trying to retain his seat and offset the financial advantage Republican challenger Richard Tisei has gained from super PACs.
Tierney over that stretch spent $434,152 to Tisei’s $90,904, while each raised about $140,000 in the first several weeks of October. That pushed Tierney’s spending past Tisei’s for the first time since the early summer.
Over the last year plus, Tierney has shelled out $1.87 million on the campaign, compared with $1.68 million by Tisei. The Republican challenger has raised more since entering the race, but Tierney entered with a substantial war chest from past campaigns.
Spending by super PACs has heavily favored Tisei, with about $3.5 million spent to support him — often by attacking Tierney — compared with about $1.3 million benefiting Tierney.Eric Moskowitz of the Globe staff contributed to this story. Noah Bierman can be reached at email@example.com. Follow him on Twitter @noahbierman.