Samples are:
IA: 35 R, 34 D, 31 I
CO: 35 R, 31 D, 34 I
NV: 40 D, 38 R, 22 I
That R+1 Iowa sample looks fair, given that '08 turnout was D+1. Same for Colorado sample, which is R+4 in this poll, but was R+1 in '08. Nevada was D+8 in '08, and is only D+2 in this poll. But to be fair, 2004 turnout in Nevada was R+4.
These polls have to be good news for Mitt Romney considering that Obama won all three of these states by no less than 9 points in '08.
Surprised to see Iowa and Nevada so competitive.
R+1 Iowa? Iowa has been more D than the US as a whole in 1988, 2000, 2004 (Kerry lost it, but he was a political turkey), and 2008... and I am not counting the three-way Clinton wins.