C'mon, Mason-Dixon is pretty much the gold standard of polling firms. You might not like the results, but they have been pretty accurate and free of bias.
You want biased...then look to NYT/CBS polls on the left and Strategic Vision on the right.
C'mon yourself, Mason Dixon may have recently gotten religion but traditionally they've drastically overweighted Dems in samplings.
They'll get more accurate right BEFORE the election because their reputation is on the line. However, I wouldn't soil my pants worrying about their current numbers.