From an Associated Press write up:
Walker recounts an email he sent to Romney voicing his frustrations during the presidential campaign. He said he urged Romney to show more passion, get out from behind the podium and connect directly with voters "like you did to the Olympic athletes" when Romney oversaw the 2002 Winter Olympics. Walker said he got no response.
Walker, a possible 2016 presidential contender, also touted his fight against collective bargaining in 2011 and wrote that Republicans in 2012 did a "lousy job of presenting a positive vision of free market solutions to our nation's problems in a way that is relevant to people's lives."