2012 presidential campaigns apply tech tools to ground game

Thursday, June 21, 2012 | 9:21 p.m. CDT; updated 10:56 p.m. CDT, Thursday, June 21, 2012

FAIRFAX, Va. — The red and blue T-shirts that Mitt Romney campaign volunteers wear in Virginia feature a digital code that voters can zap with their smart phones to learn more about the Republican presidential hopeful.

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