WASHINGTON — The ball just keeps rolling: Elizabeth Warren has launched an exploratory committee to consider a run for the U.S. Senate.

Warren filed the papers Thursday and launched a website, www.elizabethforma.com, where visitors can donate to the prospective campaign and sign up for updates.

Warren has been traveling around the state on a so-called listening tour. She told a crowd in Ashmont, Mass., Monday night that she'll make her final decision around Labor Day, according to WBUR.org.

The Progressive Change Campaign Committee, which had called on the White House to nominate or appoint Warren as director of the Consumer Financial Protection Bureau, said last week it had raised more than $100,000 and enlisted 54,000 volunteers to aid Warren's election bid.

If she runs, Warren would be facing off against Sen. Scott Brown, who won his seat in a special election last year to succeed the late Sen. Edward Kennedy.

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