Morning Digest: Everyone in Iowa is sharing polls they like. Which should you believe?

_{The Daily Kos Elections Morning Digest is compiled by David Nir, Jeff Singer, Stephen Wolf, Daniel Donner, and Cara Zelaya, with additional contributions from David Jarman, Steve Singiser, James Lambert, David Beard, and Arjun Jaikumar.}

Leading Off

● Iowa: Both Republican and Democratic groups in Iowa have released internal polls favorable to their own causes in recent days, though importantly, the two parties didn't survey the same races. On the GOP side, Cygnal puts Republican incumbents well ahead for Senate and governor and also finds a challenger in striking distance of taking down America's longest-serving attorney general. Democrats, for their part, have publicized polls showing tight contests in two competitive GOP-held House seats in the eastern part of the state.