Article snippet: They strolled through the construction site like the old friends they are, Mayor Martin J. Walsh and the former vice president, Joe Biden, interchangeably wrapping a hand around the other’s shoulder, greeting worker after worker on Wednesday afternoon. Then, in an unannounced move, the two of them strayed from their tour of the nearly completed Martin’s Park on Sleeper Street and marched the half-mile to the Massachusetts Fallen Heroes Memorial, surrounded by a crowd of media cameras and other followers — their own little parade on a sunny afternoon in the Seaport. In the jubilance of the moment, Walsh could have announced that he and his team are behind Biden, who polls show as the early front-runner in a crowded field for the Democratic nomination for president. But he didn’t. At least not yet. Not with so many other candidates, including Elizabeth Warren, the senior senator from Massachusetts, very much in the mix. “I’m still going to wait and see; I’m going to give it a little more time to see what happens,” the mayor told reporters afterward, once Biden had jumped in his car to head to another event and, eventually, two evening fund-raisers. The hesitance shows the fine line Walsh, a mayor who boasts a longtime, close relationship with the former vice president, has to walk in a heated Democratic primary race. Several of the candidates can claim Walsh as a friend, and they would be glad to have his endorsement, which would presumably come with the former un... Link to the full article to read more