If a special election for Sen. John Kerry’s seat were held today, Sen. Scott Brown (R-Mass.) would win easily, according to a WBUR poll.

The senator, who was defeated by Elizabeth Warren last month, dominates potential Democratic challengers, including Gov. Deval Patrick, state Attorney General Martha Coakley and Reps. Ed Markey and Mike Capuano. Brown’s favorability rating, at 58 percent, is far higher than any of his possible rivals. He leads a generic Demcorat 47 to 39 percent.

Should President Obama nominate Kerry as the next secretary of state, a special election will be held for the veteran Massachusetts Democrat’s seat sometime in 2013. (Until that election, Patrick would appoint a placeholder to the seat — possibly former governor Michael Dukakis.)

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