(CNN) — Make no mistake about it. Joe Biden was definitely running.
He's not yet launched a bid for president, but Biden sent a well-timed signal of exuberance and political vitality on Monday, leaving reporters and Secret Service agents in his wake as he jogged through adoring crowds on Labor Day in Pittsburgh.
The old Joe was back. And the crowd was cheering "Run, Joe, run!"
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Beaming, and looking more joyful in public than at any time since the tragic death of his son Beau in May, the 72-year-old's energetic trek through streets lined with well wishers, who seemed delighted to see him, did nothing to quell speculation that he may jump into the Democratic presidential race.