According to CAIR, 85% of Muslim voters picked Obama for President in the 2012 election. This supports my previous post in which I believe the Muslim vote helped Obama defeat Romney.  This is what CAIR said based on their exit poll:

CAIR’s email survey of more than 650 American Muslim voters indicates that just four percent of respondents cast their ballots for Mitt Romney.

Poll findings:

95.5 of the Muslim voters said they went to the polls on November 6.
85.7 percent cast their ballots to re-elect President Obama.
4.4 percent of respondents said they voted for Mitt Romney.
Just over two percent (2.2) of respondents said they voted for Libertarian candidate Gary Johnson. The same percentage (2.2) of respondents said they voted for Green Party candidate Jill Stein. [NOTE: More than four percent of respondents declined to say who they voted for.] States with the highest number of survey respondents (in descending order) were California, New York, Texas, Virginia, Illinois, Florida, Michigan, Maryland, Pennsylvania, New Jersey, and Ohio.
Of those who voted, 8.3 percent said they did so for the first time.
41.5 percent said they consider themselves Democrats. A similar number, 40.6 percent, consider themselves politically independent. Only 7.4 percent said they are Republican.

Source: CAIR