Polling samples and party ID

“ … don’t fall for the cry of biased or unweighted Party ID samples. There’s a reason Party ID samples have skewed Democratic of late. Pretending otherwise is not scientific. It’s just a form of denial that will inevitably lead to disappointment.”

http://themoderatevoice.com/161643/latent-partisans-or-why-the-party-id-sample-skews-democratic/#2goEJkX0345GHKwa.99