"This new biography of Joseph R. McCarthy shows how the Wisconsin Senator's campaign against American Communists prized sensation above truth. McCarthy often put aside his hunt for Reds while he pursued his anti-communist critics. He fought foes not just with noisy accusations but with covert gossip. He was gullible enough that some con artists managed to lure him on wild goose chases. The man who charged others with being "dupes" was sometimes one...