There are very different views of President Franklin D. Roosevelt today because of politics. Liberals tend to admire Roosevelt and to see him as one of the greatest presidents ever. Conservatives often believe that many of the problems that face the country today are Roosevelt's fault.
FDR's New Deal programs got the government much more involved in the economy than it had ever been. Liberals like this because they believe that the government should intervene to make sure that people have a certain standard of living. They also want the government to make sure that employers aren't mistreating and exploiting workers.
Conservatives, by contrast, think that the government intrudes too much in today's economy. They feel that government regulations stifle growth. They feel that programs like Social Security bankrupt the government and make people dependent on the government. Because FDR started these types of programs, they feel that he is at fault for many of our current problems.