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COLUMBUS, Ohio-- Being on the shortlist for vice president has its perks: The media take an interest in your every move, you sell off those extra copies of your memoir and everyone wants to hear your stance on the issues. But as the remaining hopefuls are discovering, it also takes work. "I've spent a lot of time around the state, I'm sharing the campaign for Governor Romney here," Republican Sen. Rob Portman said Tuesday after meeting with local residents at a farm near Shelby, Ohio. Portman is considered to be one of the top three contenders to become Mitt Romney's running mate. "I'm going to work my heart out for him no matter what. And I really believe that is what it comes down to." Since Portman endorsed Romney during the primaries in January, he has been a tireless advocate for the former Massachusetts governor. He has appeared publicly with Romney several times, he traverses his state regularly on Romney's behalf, and continues to raise serious money for the...