When asked whether the Constitution should be amended to define marriage as only between a man and woman, which would preclude states from sanctioning same-sex marriages, 50 percent of Americans say they would favor such an amendment, while 47 percent are opposed, Gallup News Service reported.

Gallup's annual Values and Beliefs survey found that 39 percent believe marriages between homosexuals should be recognized by the law as valid, with the same rights as traditional marriages.

The poll found that 66 percent of Republicans favor a constitutional amendment that would define marriage as a heterosexual institution, while 55 percent of Democrats oppose this.

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