In the United States, female residents outnumber male residents. Female citizens are more likely to vote, and during the 2008 election, they greatly outnumbered male voters (by millions of votes). The information shown on the table indicates that female voters were more likely to support Barack Obama, while male voters were split between Obama and John McCain. The number of female citizens who voted for Obama was significant enough to propel Obama to victory in the 2008 election.