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The Boston Globe

Metro

Candidates aim to stand out at congressional debate

The candidates sitting under the bright television lights of a high-stakes debate on Tuesday all faced the same daunting task: persuading voters that they would make the strongest US representative, even though their liberal positions on many hot-button issues are essentially indistinguishable.

It is the same challenge that has dogged the seven Democrats vying to succeed Edward J. Markey in the months since the race for the Fifth Congressional District heated up in June, when Markey was elected to the US Senate.

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