Lyndon B. Johnson is famous for taking over after John. F. Kennedy was assassinated, passing of the Civil Rights Act and his focus on the "Great Society" that he wished for America to become. Johnson coming into office immediately after Kennedy's death left him trying to push through bills the deceased president had wanted to see enacted.
Johnson recruited John F. Kennedy's brother, Bobby Kennedy, to spearhead the movement to get the Civil Rights act passed. This kept the President covered politically if it should fail as well as work in his favor to get it passed. In an attempt to keep Congress from blocking the bill, he moved through other bills first, leaving the Congress with nothing but filibusters to fight with. The bill passed in March of 1964 and was signed into law that same July.