Yes, but where are they done, and by whom? On the streets, by telephone or online? Then were are they publicized?
I've never been a poll watcher so don't know.
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Most MSM polls do that
Rassmussen adds 5% democrats
Zogby adds dems too
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I split the spread between dems and Republicans - add 1/2 to Republicans - subtract 1/2 from dems
That usually is how the election results shake out