As part of a presidential team effort to combat the widely held belief among voters that Joe Biden is too old to serve a second term, his aides have been giving reporters more of a peek at the man they know behind the scenes. His staffers say Biden swears in private, chews out aides who aren’t performing up to standards, and is well versed in the details of complex regulatory issues. According to two accounts, Biden can also get a little spicy, in a........

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