Jeanne Shaheen, the Democratic senator from New Hampshire, leads her likely Republican challenger Scott Brown by just three points in a new poll commissioned by American Crossroads. The conservative super PAC's poll of likely New Hampshire voters was conducted at the end of August. John DiStaso has more details:

Shaheen leads Brown 44 to 41 percent with Libertarian Gardner Goldsmith supported by 9 percent, while 6 percent are undecided, according to the GOP polling firm. Goldsmith was included in the poll despite not having gathered enough signatures to make the ballot.

This is the second poll in recent weeks to suggest a tightening contest between Shaheen and Brown. This comes after several months of a wider race, with Shaheen leading in some polls by double digits.

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