In 1965, when the Republican Party lost the majority in the State Senate for the only time since 1939, Brydges was elected Minority Leader of the Senate. Court ordered voting rights redistricting lead to senators serving one year terms in 1965 and 1966. The Republican Party regained the majority in 1966, and Brydges became Majority Leader. He was a delegate to the New York State Constitutional Convention of 1967. As Majority Leader, Brydges worked closely with Gov. Nelson Rockefeller on policy development and legislation. His main focus continued on educational issues, along with upstate economic development. He worked with Rockefeller to create the State University of New York system and to develop new school state aid funding formulas. Brydges worked with Rockfeller in the creation of new state agencies and reorganization of the New York City mass transit system. As Majority Leader, Brydges remained an advocate for Western New York and tourism development in Niagara County. He was an early supporter of casino gambling in Niagara Falls. In 1972, Brydges successfully passed legislation to legalize casino gaming in New York State through an amendment to the state constitution. The casino amendment did not pass in the end, since the state constitution requires the passage of legislation in two consecutive legislative sessions and then passage of the majority of the state's voters in a statewide referendum. Brydges' vision in the area of casino gaming was realized with the opening of the Seneca Niagara Casino on January 1, 2003. Brydges was a fierce advocate for the pro-life movement and blocked legislation to legalize abortion in New York. In 1970, Brydges allowed the Senate to vote on legislation to legalize abortion. He did so under the belief the Senate would not pass the bill. When the Senate surprised him and passed the bill, which had already passed the Assembly and had the support of Governor Rockefeller, Brydges reportedly sat in his Senate chair and wept.
In 1972, both Rockefeller and Lt. Gov. Malcolm Wilson left the state on the same afternoon. Under the state constitution, this made Brydges the Acting Governor of New York for several hours. As acting governor, Brydges signed routine state paperwork and conducted Senate business. He did not sign any legislation into law, including a pending bill relating to Niagara Falls that he had sponsored. In 1972, Brydges did not seek reelection to the Senate and he retired on January 1, 1973.
Personal life
He married Eleanor C. Mahoney. Together, they had five sons and two daughters, including:
Earl W. Brydges, Jr., who married Martha Ann Shalala in 1967.
Thomas Eugene Brydges, who married Roxanne Catherine Hammer in 1972.
The Earl W. Brydges Artpark in Lewiston, New York, an outdoor theater and concert center that he championed, was named in his honor. In addition, the main public library in Niagara Falls, the Earl W. Brydges Library, designed by architect Paul Rudolph, was named after him.
