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Ryan is also well-known for his fiendish physical fitness workouts.

His congressional district in southeast Wisconsin has something of a bipartisan voting record. Obama took 54 percent of the vote there in 2008, while the congressman received 64 percent in winning re-election.

Outside Ryan’s home in Janesville, Wis., on Friday night, there was nothing to suggest that the residence belonged to a vice presidential candidate. An Associated Press reporter who knocked just before midnight got no answer. There was a light on in a first-floor room of the two-story brick home atop a hill.

Earlier this week, a Ryan adviser said the congressman, his wife and their three children were preparing for a weeklong Colorado vacation.

Most of Romney’s staff learned of the planned announcement during a 10 p.m. EDT conference call Friday about an hour before the campaign issued a statement. The identity of Romney’s pick was not disclosed during the call. The campaign had promised that first news of the selection would be delivered via a phone app.

Earlier in the day, Romney’s campaign briefed reporters on the bus tour without mention of the impending vice presidential announcement.

The tour will take Romney through North Carolina, Virginia, Florida and Ohio. All are battlegrounds where Obama won in 2008. They hold 75 electoral votes combined, of the 270 needed to win the election.