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The Dolphins have started 16 quarterbacks since Dan Marino retired and are looking to make another change. While incumbent Matt Moore played well last year, there are doubts he’s a franchise quarterback. Chad Henne, who started 31 games for Miami over the past three seasons, signed Wednesday with the Jacksonville Jaguars as a backup.

The 49ers emerged as a contender for Manning when the news surfaced that he worked out Tuesday for Harbaugh at Duke. The four-time NFL MVP also worked out for the Broncos on Friday at Duke, and for the Titans on Saturday in Knoxville, Tenn.

Manning has been rehabbing in North Carolina following a string of neck surgeries, which led Indianapolis to release him.

San Francisco running back Frank Gore, who works out each offseason in Miami, said Sunday he hadn’t spoken to Smith. Gore has long supported Smith through the quarterback’s up-and-down seven NFL seasons.

Now, Gore and the 49ers are sitting tight to see what happens next.

“It’s crazy,” Gore said. “I’m waiting for whatever happens. I know coach Harbaugh and (general manager) Trent Baalke feel good about what they’re doing.”

Manning’s whirlwind free agency tour officially kicked off soon after he bid farewell to the Colts in an emotional press conference.


AP Sports Writers Teresa M. Walker in Nashville, Tenn., Joedy McCreary in Durham, N.C., Pat Graham in Denver and Janie McCauley in San Francisco contributed to this report.