Democratic internals have consistently been more accurate than Republican ones. Bury your head in the sand all you want, but you're not entitled to your own facts.
And Democratic internals are not more accurate than gold standard polls like Selzer and PPP.
That Selzer poll is an obvious outlier, or they weren't pushing undecideds very much. PPP and this poll are not that different.
Selzer was more accurate than PPP was in Iowa.
It's odd to see someone attempt to write off Selzer given their track record. Also, for Selzer's poll to have been an actual outlier, wouldn't it have had to be the only poll out there showing Ernst up 6? Quinnipiac had that same margin.