Republican presidential candidate and former Massachusetts Gov. Mitt Romney, right, kisses his wife Ann during a campaign rally on Sunday in Port St. Lucie, Fla. (AP Photo/Lynne Sladky)

Question: I've posted other presidential candidates on the campaign trail kissing their wives, including the well-photographed kiss that former VP Al Gore gave Tipper (before the 2010 separation, of course). How does this kiss compare to others involving high-profile politicians?