I've just been to their website and it looks they only polled these 27 states this time.
Not all 50 ... 
I believe only AK, DE, ID and WY have not been polled for the presidential election. RI hasn't been polled since Feb 2011. Every other state has had at least one poll in the past year.
What about Arkansas, Lousiana and Mississippi? I don't recall having seen polls in those states.
LA polled by Clarus, Oct 2011, MS polled by PPP, Nov 2011, AR polled by Hendrix college, March 2012, all showed not much change from 2008.
