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There is no popular vote for President.
The President is elected by the electors of each state.
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See post 16.
While electors still ultimately vote for the President, 30 states have laws that bind the electors in some way. Many of these laws force electors to vote according to the states popular vote. Thus, these laws mute the elector’s individual decision and bypass the Constitution.
http://www.ncsl.org/research/elections-and-campaigns/the-electoral-college.aspx
Go to the section called “STATES WITH LAWS THAT ATTEMPT TO BIND THE VOTES OF PRESIDENTIAL ELECTORS”.
JoMa