Sandman,
If I'm interpreting the results of the poll you quoted correctly, about a third of the electorate are riding the fence on the issue of troop withdrawals, wanting some to be withdrawn but realizing the necessity of maintaing a troop presence in Iraq, at least for the short term.
What happens between now and the end of the year could tilt them either way.
Despite Democratic hopes for a watershed election in November, the ideological split between Americans remains intact. I predict we will see a Congress split right down the middle, with Democrats controling one house, and the Republicans controlling the other, and continued bad feelings all around.
Regards, Shuckins