Also, did you click through the "liberalism" link in that quote?
It includes:
Liberal Republicans[edit]
Abraham Lincoln's presidency, with its emphasis on a strong federal government over claims of
state's rights, on widespread entrepreneurship, and on individual freedom against the property rights of slave owners, laid much of the ground work for future liberal Republican governance. The Republican Party's liberal element in the early 20th century was typified by
Theodore Roosevelt in the 1907–1912 period (Roosevelt was more conservative at other points). Other liberal Republicans included Senator
Robert M. La Follette, Sr., and his sons in Wisconsin (from about 1900 to 1946), and western leaders such as Senator
Hiram Johnson in California, Senator
George W. Norris in Nebraska, Senator
Bronson M. Cutting in New Mexico, Congresswoman
Jeannette Rankin in Montana, and Senator
William Borah in Idaho, from about 1900 to about 1940. They were generally liberal in domestic policy, supported unions,
[48] and supported much of the
New Deal. However, they were intensely isolationist in foreign policy.
[49] This element died out by the 1940s. Starting in the 1930s a number of mostly Northeastern Republicans took modern liberal positions regarding labor unions, spending and New Deal policies. They included Governor
Harold Stassen of Minnesota,
[50] Governor
Thomas E. Dewey of New York, Governor
Earl Warren of California,
[51] Senator
Clifford P. Case of New Jersey,
Henry Cabot Lodge, Jr., of Massachusetts, Senator
Prescott Bush of
Connecticut (father of George H. W. Bush), Senator
Jacob K. Javits of New York, Governor
William Scranton of Pennsylvania, and Governor
George Romney of Michigan.
[52] The most notable of them all was Governor
Nelson Rockefeller of New York.
[53]
Liberalism and progressive education in the late 1880s is not the same as now. Nor does one have to be socialist to be liberal or progressive.