Were they Socialists who wanted to destroy America as we know it?
Theodore Roosevelt--Responsible for FDA amongst other agencies, national parks system.
Truman- Wanted to enact "Fair Deal", wanted to create Univeral Healthcare, created public housing.
Eisenhower--Protected New Deal despite chance to destroy it, derided those who wanted to destroy the New Deal, expanded it in some parts, created national highway system. Was considered a "Socialist agent" by the John Birch Society.
LBJ- Great Society.
Nixon- Expanded on Great Society, enacted wage and price controls, created EPA, OSHA, proclaimed first Earth Day, wanted Universal Healthcare system and guaranteed income.
Reagan- Upheld and saved Social Security, thought of Nixon as a great President even during Watergate and defended him till the end, admired TR, still praised FDR as a leader (not his policies, but his leadership) even while President, did not want to dismantle New Deal (felt New Deal was moral but Great Society was immoral), national debt increased dramatically under his watch, publicly promoted Brady Bill and free trade after leaving office, called for repeal of 22nd Amendment.
I really don't see what makes Obama a "radical' compared to TR, Eisenhower, FDR, LBJ or Nixon. Nixon certainly didn't consider himself a Socialist and was rabidly anti-Communist, yet enacted policies most here would call Communist.