2012 election registration:
Democrats 36% of registered voters down 2.8% from 2008
Repubs 27.2% flat from 2008
Independents 23.8% up 2% from 2008
This does not add to 100% because overall turnout 63% of eligible voters.
Point being, do not look at polls and say Dems are oversampled. If the mix looks like 2012, it’s a legit measure. It may not prove to be this year’s mix, but it’s SUPPOSED to be Dem heavy.