And what of the "large social support network"?
Do they have jobs or are they just Cuban?
A support network must needs be durable beyond welfare and WIC.
Cubans dominate the business community in Miami-Dade County. Remember that the largest wave of Cuban immigrants who came to this country in the 1960s-1970s were from the upper and middle classes. A large business community, combined with substantial social support networks (mutual aid societies), have made other ethnic groups (blacks) jealous of Cubans relative success.
Mexicans have such a "large social support network" here that they are able to send 14 billion USD back to the motherland each year.
The Cuban community in South Florida is by and large solidly middle and upper middle class. Elian Gonzalez's uncle has purchased the house where Elian lived and turned it into a museum, they are hardly paupers.
http://www.newsmax.com/archives/articles/2000/11/5/233738.shtml