Unions wrote more big checks than corporations in 2013

When it comes to writing big checks to favored candidates and causes, unions last year seemed to be taking greater advantage of the landmark Citizens United decision than corporations.

A Sunlight analysis of groups and individuals who wrote checks of $10,000 or more to super PACs and other political committees that report to the FEC revealed big labor bested big business in 2013 by better than 2-to-1.