Elizabeth Warren raised $3.7 million over the last six weeks, while Scott Brown took in $2.3 million

By Michael Levenson, Globe Staff

Democrat Elizabeth Warren continued to raise more money than her Republican opponent, Senator Scott Brown, taking in $3.7 million to his $2.3 million over the last six weeks, according to federal records released today.

Brown, however, still has more money in the bank -- $14.2 million to Warren’s $12.3 million, as the candidates head into closing months of what has become the nation’s most expensive congressional race.

Warren, who has built one of the most formidable campaign finance operations in the country, has consistently raised more money than Brown.

But Brown has been bringing in large sums, as well, and had money left in the bank from his 2010 Senate race, allowing him to maintain a larger warchest than Warren.

The flood of money into the race has allowed both candidates to pack the airwaves with ads, a deluge that is expected to continue unabated until Election Day in November.

In the same period, Republican congressional candidate Richard R. Tisei raised $172,585, outpacing the Democratic incumbent, Representative John F. Tierney of Salem, who raised $126,044. Tierney, however, has more cash on hand, $729,003 to Tisei’s $630,942.

Tisei has already begun advertising on television in what is considered one of the most competitive congressional races in the state.