One of the things about polls is sometimes you just end up with a bad sample. It doesn’t make the pollster bad, it just makes that particular result bad. For example the Politico poll showing a dead heat in Missouri with this finding:
Towery acknowledged that the poll showed a closer-than-expected race among black Missourians – Obama took a lower-than-usual 65 percent of the group – and said that if African-Americans ultimately vote for Obama by the huge margin analysts expect, “it will make the race closer.”
Sometimes you don’t like polls because they don’t give you the results you want. Sometimes you don’t like polls because they don’t conform to reality. This is one of the latter examples.