Washington — Sen. Bill Cassidy strongly criticized Health and Human Services Secretary Robert F. Kennedy Jr. over his vaccine skepticism and handling of the nation's public health, despite having delivered the key vote to advance Kennedy's nomination last year.  Cassidy, a medical doctor who chairs the Senate health committee, said on "Face the Nation with Margaret Brennan " that it's "easy to surmise" that Kennedy made promises to him to win his vote, and since then, the commitments that the