A top aid to Margolies has set up an outside "527" group called Marjorie 2014 and has purchased marjorie2014.com. The former congresswoman is considering a run for the open seat currently held by Rep. Allyson Schwartz (D-Pa.), who is running for governor, and has said she'll decide on a run by the end of May.

Margolies, then Margolies Mezvinsky, was a loyal ally of the Clintons during her one House term, voting for President Clinton's budget and healthcare reform plan despite her old district's toss-up nature and close 1992 election. She lost in the 1994 GOP landslide and hasn't held office since.

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Her son, Marc Mezvinsky, married Chelsea Clinton in 2010.

Bloomberg first reported the new outside group.