In this Sept. 23, 2012 file photo, Mitt Romney greets the crowd during a campaign event at D’Evelyn High School in Denver. (AP Photo/Charles Dharapak, File)

 

              In this Sept. 23, 2012 file photo, Mitt Romney greets the crowd during a campaign event at D’Evelyn High School in Denver. (AP Photo/Charles Dharapak, File)
In this Sept. 23, 2012 file photo, Mitt Romney greets the crowd during a campaign event at D’Evelyn High School in Denver. (AP Photo/Charles Dharapak, File)