FILE - In this Sept. 6, 2012 file photo, President Barack Obama laughs with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C. 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/Lynne Sladky, File )

Associated Press
FILE - In this Sept. 6, 2012 file photo, President Barack Obama laughs with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C.  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/Lynne Sladky, File )
FILE - In this Sept. 6, 2012 file photo, President Barack Obama laughs with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C. 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/Lynne Sladky, File )
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