Not overwhelmingly. The rural areas in the northwest of the state are hard-red, but the rest of the rural areas vary from mostly-red to evenly split. Des Moines is mostly split, but the SE and E areas are fairly blue. My federal house district includes the heart of downtown Des Moines and almost exactly split down the middle, which is partially why our last house race was so contentious. The state just happened to barely go for GWB in 2004 because of John Kerry's weak campaign.