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Then Democratic Senate candidate Elizabeth Warren speaks during a debate with Republican incumbent Sen. Scott Brown in Springfield, Mass. on Oct. 10, 2012. Nearly a year later, Sen. Warren is fundraising on behalf of other Democrats including Sen. Jeanne Shaheen, D- N.H., who Brown has threatened to run against. (AP Photo/Elise Amendola)

As former Republican U.S. Sen. Scott Brown continues to agitate Democrats by hinting at various potential political runs, Sen. Elizabeth Warren, who defeated him in November, is keeping an eye on the Wrentham Republican.

In a fundraising pitch sent to her supporters on Friday, Warren's campaign manager and current chief of staff Mindy Myers passed along a message from U.S. Sen. Jeanne Shaheen, D- N.H., who Brown has threatened to run against since he owns a home in New Hampshire. Myers also threw in her own jab at Brown, vowing to help defeat him should he attempt such a campaign.

"Believe it or not, our old friend Scott Brown is considering a move north to New Hampshire to run against Senator Shaheen in 2014," Myers writes. "With your help, we beat Scott Brown and elected Elizabeth Warren in Massachusetts. Let's show Scott Brown: If he decides to run against Jeanne Shaheen, we'll be there once again to stop him."

A Public Policy Polling survey released last week showed Shaheen winning over Brown by only four points in a hypothetical 2014 Senate campaign match-up. In her fundraising pitch, Shaheen points to the record amount of money spent in the infamous 2012 Brown-Warren campaign, specifically noting Brown's fundraising prowess.

U.S. Sen. Jeanne Shaheen, D-N.H.

"Brown and his funders spent $40 million attacking Sen. Warren. If they run here, all signs point to a repeat of that kind of spending," Shaheen wrote. We need to take a big step forward in our effort to build the strongest grassroots campaign New Hampshire's ever seen. Whether the Republicans ultimately nominate Brown or state Sen. Jim Rubens, who recently announced, we have to be ready."

Warren's latest campaign dispatch on behalf of Shaheen is the third of such efforts this week, as she extended her political star power on behalf of Democrats including Sen. Mary Landrieu of Louisiana, Sen. Kay Hagan of North Carolina. and Sen. Jeff Merkley of Oregon.

Since losing his U.S. Senate seat to Democrat Elizabeth Warren in November, Brown has taken a gig as an on-air contributor for Fox News; joined the Kadant paper company board of directors; joined the Nixon Peabody law firm in Boston; joined CoachUp, a Boston-based company that helps connect private coaches with kids, as a senior adviser; and most recently took a position as co-chair of the Bipartisan Coalition for American Security. This week, he also joined the Florida-based Global Digital Solutions, Inc. as a consultant.

As far as politics are concerned, Brown has kept his name in circulation and his options open for the future. Brown declined to run for governor of Massachusetts in the 2014 election, and he is instead supporting 2010 GOP gubernatorial nominee Charlie Baker. Brown told reporters at an April event in Nashua, N.H., that he isn't ruling out a run for the U.S. Senate in that state.

Brown, who was recently testing the waters in Iowa for a future presidential run, will return to the state on Nov. 12 as the keynote speaker for a GOP organization's annual Ronald Reagan Dinner. Closer to home, Brown will give the keynote address at the Connecticut Republican Chairman's Dinner on October 2nd in Norwalk, Conn.