(BOSTON.COM) — Mitt Romney implicitly accepted the Republican presidential nomination Tuesday night, leaving behind the intraparty fighting that at times sullied his candidacy and vowing to defeat President Obama with a pledge to restore both the economy and Americans’ belief in the future.

Speaking as results were showing he was on the verge of sweeping five primaries, Romney reflected only briefly on the path that led him back to New Hampshire for a boisterous victory rally.

“After 43 primaries and caucuses, many long days and more than a few long nights, I can say with confidence – and gratitude – that you have given me a great honor and solemn responsibility,” Romney told supporter at the Radisson hotel in downtown Manchester.

“To all of the thousands of good and decent Americans I’ve met who want nothing more than a better chance, a fighting chance,” Romney added. “To all of you, I have a simple message: Hold on a little longer. A better America begins tonight.”

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