Cambridge City Councilor Nadeem A. Mazen, the state's highest-profile Muslim elected official, who had planned to run against US Representative Michael E. Capuano in next year's Democratic primary, now has his eyes set on a different congressional seat.

On Thursday, he filed a statement of candidacy to run for the Lowell-anchored Third Congressional District seat held by US Representative Niki Tsongas, who is retiring.

Should Mazen make the announcement official, he'll join a field of several other Democrats hoping to succeed Tsongas in the Democratic-leaning district, which runs along the New Hampshire border from Haverhill to Winchendon, and south to Marlborough and Hudson.

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