Newsweek poll is of "adults", not registered voters.
Adults means that the proportion isn't necessarily representative of the real democgraphics.
http://www.pollingreport.com/BushJob1.htm
Newsweek Poll conducted by Princeton Survey Research Associates International. Nov. 9-10, 2006. N=1,006 adults nationwide. MoE ± 3.
there's all these polls of non reg. voters i have been voting since 1978 NO ONE HAS POLLED ME EVER what's with that