anchor: Eventually, his forced resignations from the Truman and Eisenhower administrations led Rockefeller to turn to elective office as the one way of establishing an independent base.
positive: His forced resignations from the Truman and Eisenhower administrations have eventually led Rockefeller to turn to elective office as the one way of establishing an independent base.
negative: Eventually, his forced resignations from the Eisenhower and Truman administartions led Rockefeller to turn to alcoholism as one way of establishing peace.