How did the level of participation of female voters affect the 2008 presidential election?

Women made up a slightly larger share of voters than men in 2008, and they favored Barack Obama: about 56% of women voted for him, compared with about 43% for John McCain. So female voters helped Obama win, though “overwhelmingly” overstates the size of their margin. The best choice is “Female citizens voted overwhelmingly for Barack Obama.”

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