I would like to respond to the Mets' question with a correlation response (rather than a causation response). Many very urban-poor cities in the United States have had, at least since the 1950s or 1960s, liberal and progressive mayors and city councils. Let's just take Detroit, which we can all agree is a city with a large poverty problem (among many other problems).
Detroit has had Democratic mayors since 1962.
http://en.wikipedia.org/wiki/List_of_mayors_of_DetroitDetroit questions left unanswered (by me anyway):
- Were the Democratic mayors liberal progressives?
- Did Democratic mayors (or city council members) institute liberal/progressive policies?
- Did those liberal/progressive policies cause the issues with Detroit?
- What were the other factors?
Politicians don't operate in a vacuum (although many may propose that we throw them in a vacuum), but I suspect that one would find little evidence that liberal/progressive policies, acting alone, raise people out of poverty.