Hoover died in May 1972. How was he involved in the Nixon reelection campaign?
Nixon mentions Hoover on several of his office tapes, the most infamous being in late 1971, when he said, “as soon as I am reelected I'm getting rid of that old bastard.” Hoover could not get ‘up’ on Nixon and feared that his time had come. As it would turn out, he died before Nixon could fire him.
There has been clear evidence that someone knew about Nixon's ‘plumbers’ and had been feeding information to the justice department as early as 1970. E. Howard Hunt sated several times that he ‘knew’ it was Hoover that was tracking them and blown the whistle.
It's rather funny that liberals try to link Nixon and Hoover together as if they were great conspirators. The actual truth is:
FDR (D) - allowed Hoover to report to him directly and had him spy on Walter Reuther and the teamsters.
Truman (D) - didn't like Hoover but was afraid to act.
Eisenhower (R) could not stand Hoover and minimized him. Swore he would get rid of him before he left office. The U2 incident derailed those plans.
Kennedy (D) Used Hoover to spy on the civil rights movement and to ‘fix’ situations involving beds JFK shouldn't have been sleeping in. The wire tap authorizations Hoover used on Martin Luther King were signed by Bobby Kennedy (boy does that make liberals heads explode!)
LBJ (D) Used Hoover to spy on the civil rights movement and the antiwar movement.
Nixon (R) -Zip
That facts make it very clear - almost ALL of the abuses that Hoover committed and liberals go so crazy over, happened while a democrat was President.