President Joe Biden, 81, “has no impairment,” Attorney General Merrick Garland claimed in the octogenarian’s defense on Tuesday. While testifying under oath before a House appropriations subcommittee, Garland said “the president has no impairment” because he “watched” Biden conduct meetings. About one-third of Democrats doubt Biden’s mental fitness, a Harvard/Harris survey recently found. Another poll revealed 82 percent of Americans harbor concerns about his physical and mental health. Only about one-quarter of voters say Biden is physically or mentally fit to serve a second term, Quinnipiac found. “I have watched him expertly guide meetings of staff and of cabinet members...