Swing set

A look at the margin of win by state in the past four U.S. presidential elections.

States in bold represent traditional swing states

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Note: Electoral vote allocations based on 2010 Census.

Sources: Federal Election Commission; The American Presidency Project, University of California at Santa Barbara, G. Peters and J. Woolley; U.S. Census Bureau; Reuters
By Ashlyn Still and Christine Chan | REUTERS GRAPHICS