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Income is growing much faster in Republican-leaning "red states" than in Democratic-tilting "blue states" or the pivotal swing states that will decide the 2012 presidential election, a USA TODAY analysis finds. By Dale Wetzel, AP Construction workers lift materials at an apartment site in northeast Bismarck, N.D., on Tuesday. According to a USA TODAY analysis, North Dakota, a red state, tops the nation in income growth thanks to an oil boom. Construction workers lift materials at an apartment site in northeast Bismarck, N.D., on Tuesday. According to a USA TODAY analysis, North Dakota, a red state, tops the nation in income growth thanks to an oil boom. Sponsored LinksPersonal income in 23 red states has risen 4.6% since the recession began in December 2007, after adjusting for inflation. Income is up just 0.5% in 15 blue states and Washington, D.C. , during that time. In the dozen swing states identified by USA TODAY that could vote either way Nov. 6,...