Master of the Senate is a book that deals with the Senatorial career of Lyndon B. Johnson by the American writer Robert Caro.
In Master of the Senate, Caro chronicles Johnson's rapid ascent in the United States Congress, particularly focusing on his tenure from 1949 to 1960 as Senate majority leader with the aim to show "how legislative power works in America".[1] This 1,167-page work delves into Johnson's political acumen that Caro argues transformed the Senate from a stagnant institution into a dynamic legislative body by manipulating Senate rules, building a powerful coalition, and securing legislative victories, thereby laying the groundwork for his ascent to the presidency.