Elizabeth Warren gave her supporters and campaign managers complete credit for teaching “a scrappy first-time fighter to get in the ring and win” and building one of the “best grassroots [armies] that any state has ever seen” to do it.

“You did what they thought was impossible,” the Harvard Professor told a crowd of cheering voters during her victory speech at the Fairmont Copley Plaza Hotel. “You took on powerful Wall Street banks and you let them know you wanted a Senator to fight for the Middle Class all of the time.”

On Tuesday, November 6, Warren became the first female Senator in Bay State history, beating out Republican incumbent Sen. Scott Brown.

“I didn’t build that, you built that,” she told a crowd of energetic Democrats.

Warren unseated Brown, who won the Senate spot in a special election in 2010, following the death of former Sen. Ted Kennedy. With 86 percent of precincts reporting, Warren led Brown 53 percent to 47 percent at the polls Tuesday night.

The victory marked the culmination of the most expensive senate race in Massachusetts history—approximately $70 million combined—and one that’s touched on a host of hot-button issues, including Warren’s claims that she is of Native American decent.

Boston Mayor Thomas Menino Tweeted a congratulatory message to the new Massachusetts Senator-elect shortly after the vote was called on Tuesday night.

“Congratulations to our next Senator, [Elizabeth Warren]. Thank you, Boston, for making the right choice today. We have great work ahead of us,” Menino said in his Tweet.

The race between Brown and Warren was called at 9:46 p.m. on Tuesday, less than two hours after the polls closed at 8 p.m. in Massachusetts.

Brown conceded about 45-minutes after major news networks reported he had lost.

“I accept the decision of the voters,” said Brown to a crowd at the Park Plaza Hotel.

When Brown said he had called Warren to concede, it drew ‘boos” from his supporters.

But Brown said despite the disappointing loss, Warren had won “fair and square,” adding that “defeat is only temporary.”

“She received the high honor of holding the people’s seat,” said Brown. “I said in the very beginning, win or lose, we would run a race that we would all be proud of, and I am very proud of each and everyone of you.”

Citing the hard work from his campaign and the support of his friends and family, Brown managed to remain somewhat stoic during his concession speech, and even cracked a few jokes.

“The most difficult part of this is [that] I have to break the news to my truck that I will be taking it home,” he said. References to his mode of transportation were a side topic throughout the Senate race.

Outside of the hotel, Brown said his campaign did everything they could, “but it was a numbers game” and he recognized the difficulty of being a Republican running for office in Massachusetts.

Back at Warren’s camp, the first-time candidate bashfully batted away roaring cheers and chants and thanked her following—as well as her husband— for their hard work and support.

She told Brown supporters that she would work to win them over and promised to invest in the future of Massachusetts students while bringing passion and energy to the state and fighting for working families.

Towards the end of her speech, Warren noted that she shared an election night victory with the late Kennedy, who first took office exactly 50 year ago to the day. She pledged to “do the same” as the late Senator, who she said put “all his strength and will” into fighting for the people of Massachusetts.

“I won’t just be your Senator, I will be your champion, I promise,” said Warren.