The Power Broker: Robert Moses and the Fall of New York is a Pulitzer Prize-winning biography of Robert Moses by Robert Caro.
 The book focuses on the creation and use of power in local and state politics, as witnessed through Moses' use of unelected positions to design and implement dozens of highways and bridges, sometimes at great cost to the communities he nominally served.
 It has been repeatedly named one of the best biographies of the 20th century, and has been highly influential on city planners and politicians throughout the United States.
Capitol Punishment: The Hard Truth About Washington Corruption From America's Most Notorious Lobbyist is a non-fiction 300-page memoir by former American lobbyist Jack Abramoff, published by WNDbooks in November 2011.
 The book, described as an "account of his political triumphs, serial lawbreaking and unethical conduct" by the "Washington Post", details the author's life in Washington as a power broker and lobbyist.
 In its last chapter, titled "Path to Reform", Abramoff lists a number of proposals to eliminate bribery of government officials.
Robert Allan Caro (born October 30, 1935) is an American journalist and author known for his biographies of United States political figures Robert Moses and Lyndon B. Johnson.
Captan Jack Wyly, Sr. (December 30, 1917 – July 14, 2006), was a colorful attorney in Lake Providence, Louisiana, who in the 1960s and 1970s was a leader of conservatives within his state's dominant Democratic Party.
 He was known for his 1960s-style suits and hats.
 His massive wealth enabled him to act as a power broker over nearly every aspect of Lake Providence affairs.
Stephen M. "Steve" Sweeney (born June 11, 1959) is an American executive, political power broker, and Democratic Party politician who currently serves as the President of the New Jersey Senate.
 He has served in the New Jersey State Senate since 2002, where he represents the 3rd Legislative District.
 On November 23, 2009, Sweeney was selected as Senate President-designate, replacing former Gov. Richard Codey.
A power broker is a person who influences people to vote towards a particular client (i.e. elected official or referendum) in exchange for political and financial benefits.
 Power brokers can also negotiate deals with other power brokers to meet their aims.
Raymond J. "Ray" Lesniak (born May 7, 1946) is an American Democratic Party politician, who has been serving in the New Jersey State Senate since 1983, where he represents the 20th Legislative District.
 Before entering New Jersey's upper house, the Senate, Lesniak served in the General Assembly from 1978 to 1983.
 Lesniak is considered a major power broker in the Democratic Party, having served as New Jersey Democratic State Chairman and New Jersey Chair for Clinton/Gore and Gore/Lieberman.
 Lesniak was a candidate for Governor of New Jersey in the 2017 election.
Joachim Kempin (born in 1942) is a German-born businessman and retired Senior Vice President of Microsoft Corporation.
 He ran Microsoft's division selling operating software to PC manufacturers for 15 years.
 He is also the author of "Resolve and Fortitude: Microsoft's "Secret Power Broker" Breaks His Silence".
Edward Dean Adams (9 April 1846 – 20 May 1931) was an American businessman, banker, power broker and numismatist.
 He was the president of Niagara Falls Hydraulic Power and Manufacturing Company which built the first hydroelectric power plants in Niagara Falls, Canada.
 The Adams Power Plant Transformer House is named after him.
 He was “conspicuously successful in corporate reorganizations”.
Shaun Going is a Canadian construction engineer who was arrested by Serbia in August 2000 and charged with terrorism.
 An acknowledged power broker with "enormous influence known to bribe and fraternise with other powerful figures in the region, including the Kosovo Liberation Army, he was quickly defended by Canada who insisted on his innocence.

Question: Who else did the author of The Power Broker write a biography of?
Answer: Lyndon B. Johnson