Massachusetts Governor Deval Patrick is keeping his choice for interim U.S. senator close to the vest.

Patrick is promising to announce today who he will appoint to fill Sen. John Kerry's seat until a special election is held in Massachusetts on June 25. Kerry was confirmed by the Senate on Tuesday January 29th to be the nation's next secretary of state.

Former U.S. Rep. Barney Frank is the only person who has publicly expressed interest in serving as the interim senator.

Other names that have drawn speculation include Carol Fulp, a Boston business and civic leader; William "Mo" Cowan, the governor's former chief-of-staff; Victoria Kennedy, widow of the late Sen. Edward Kennedy; and former Gov. Michael Dukakis.

Patrick has said his selection will be a person who is not planning to run in the special election.