FILE - In this May 23, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Washington. Romney is set to clinch the Republican nomination for president Tuesday with a win in the Texas primary, a feat of endurance for a candidate who came up short four years ago and watched this year as voters flirted with a carousel of front-runners before eventually warming to him. (AP Photo/Mary Altaffer, File)

Associated Press
FILE - In this May 23, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Washington. Romney is set to clinch the Republican nomination for president Tuesday with a win in the Texas primary, a feat of endurance for a candidate who came up short four years ago and watched this year as voters flirted with a carousel of front-runners before eventually warming to him.  (AP Photo/Mary Altaffer, File)
FILE - In this May 23, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Washington. Romney is set to clinch the Republican nomination for president Tuesday with a win in the Texas primary, a feat of endurance for a candidate who came up short four years ago and watched this year as voters flirted with a carousel of front-runners before eventually warming to him. (AP Photo/Mary Altaffer, File)
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