FILE - In this May 3, 2014 file photo, Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention in Milwaukee. Gov. Walker emerged with a major victory this week when a federal court halted a secret investigation into his 2012 recall campaign and conservative groups that supported him, ruling the probe was a breach of free-speech rights. The decision could boost his re-election campaign and better his prospects for a possible 2016 presidential run. (AP Photo/Jeffrey Phelps)
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