TAMPA -- With swing-state denizens facing 10 more weeks of campaign ad bombardment, the conservative advocacy organization Americans for Prosperity may be cutting through the clutter most effectively with its relatively low-key attacks on President Obama.That, at least, was the clear verdict offered by 23 Florida voters on Sunday during a focus group convened by Republican pollster and strategist Frank Luntz.Almost everyone in the group said they voted for Obama in 2008, but they were about evenly split between Obama and Mitt Romney in the 2012 race, with several still undecided.Luntz...

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