US Senator Edward J. Markey would lead former US Senator Scott Brown in a hypothetical November 2014 Senate matchup between the two, according to a new poll.

Forty-three percent of the registered voters surveyed said they would vote for Markey while 38 percent said they would cast their US Senate ballot for Brown, according to a new poll from the MassINC Polling Group.

Fourteen percent said they did not know or were undecided.

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Markey was sworn in to the US Senate this month after winning a special election last month to finish the term of former Senator John F. Kerry. He beat Republican Gabriel E. Gomez by ten percentage points on June 25. Markey faces voters again next year.

Brown, a Republican, was unseated by Elizabeth Warren in 2012. He was largely expected to challenge Markey in the special election, but elected not to enter the race. He has not said whether he plans to run for public office again in 2014.

The poll surveyed 419 Massachusetts registered voters by live telephone interviews from July 17-20. The margin of error was plus or minus 4.8 percentage points.