I was curious about why the camps were called Hooverville and I found this online:

"During the 1920s, men who rode the railroad cars from place to place were called hoboes. They often camped together near a river or near a railyard. They often tried to hide the camps so the police or sheriff would not run them out. During the depression, these hobo “jungles” grew to include destitute families who were waiting for work in agriculture. These areas eventually came to be known as “Hoovervilles” named after President Hoover who was president when the depression started. Some were later called Roosevelt Roosts, after President Roosevelt. Most of these camps had no running water or any sewage facilities. Buildings were generally made from materials found nearby. Few real houses were found in these Hoovervilles."

http://www.learncalifornia.org/doc.asp?id=1812

It seems that placing blame on the president in creative ways is a long running American tradition.