A new poll shows Democrat Edward Markey has opened up a double-digit lead over Republican Gabriel Gomez in Massachusetts' special U.S. Senate election. The UMass Lowell-Boston Herald poll found 56 percent of those responding favored Markey compared with 36 percent supporting Gomez. Seven percent were undecided. Of those polled who said they plan to vote for Markey, 76 percent said this is a firm choice compared with 67 percent of voters who said they will vote for Gomez. The poll also found Markey leading Gomez in all gender, age, education, income and ethnic categories.The telephone poll of 600 Massachusetts voters from June 15-19 has a margin of error of plus or minus 4 percentage points.The election to fill the seat left vacant by the resignation of John Kerry is Tuesday, June 25. Vice President Joe Biden will be attending a Markey Rally Saturday afternoon at UMass Dartmouth.

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