Republicans being out of town....or having cell phones has NOTHING to do with polling results - This is simply a myth - The fact is polling firms "weight" responses -
Therefore if they poll 200 Dem's and 100 Rep's - They still then put those responses into a "weighted" formula - Which means the 200 Dem's X .38% and the 100 Rep's X .34% -(the rest going to Indy's) - (just as an example) -
Therefore contacting more of one group over another doesn't mean a poll is biased in and of itself -
Not all poll are weighted.