Four days after his 39th birthday, Marco Rubio flashes a toothy grin in a sunlit conference hall. Crow's-feet wrinkle around his eyes as 60 supporters, mostly gray-haired and clad in pastel polos, stand and clap. More than one hand reaches for a hearing aid before the GOP candidate for U.S. Senate speaks to the group gathered in the Hyatt Regency Sarasota.
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