FILE - In this April 17, 2012 file photo, Republican presidential candidate, 

FILE - In this April 17, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney shares a laugh while meeting with a group of Pittsburgh area residents in Bethel Park, Pa, Call it the campaign trail schtick. Have you heard the one about the kid who thinks President Barack Obama's job is to "approve this message?" Or the time Mitt Romney compared another presidential run to giving birth? The jokes at presidential fundraisers and rallies are easy applause lines for Obama and Romney, a way to keep supporters entertained before more weighty subjects like Medicare, taxes and foreign policy. A good sense of humor has served presidential candidates well in the past. So it's little wonder why both Obama and Romney are using the same technique.  (AP Photo/Jae C. Hong, File)
Associated Press
FILE - In this April 17, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney shares a laugh while meeting with a group of Pittsburgh area residents in Bethel Park, Pa, Call it the campaign trail schtick. Have you heard the one about the kid who thinks President Barack Obama's job is to "approve this message?" Or the time Mitt Romney compared another presidential run to giving birth? The jokes at presidential fundraisers and rallies are easy applause lines for Obama and Romney, a way to keep supporters entertained before more weighty subjects like Medicare, taxes and foreign policy. A good sense of humor has served presidential candidates well in the past. So it's little wonder why both Obama and Romney are using the same technique. (AP Photo/Jae C. Hong, File)
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