Polls+Politicians= A Big Mess

We have read about how polls are used to prove a point. I have one and I going to use a poll. Americans are infuenced by this Adminstration negatively or positively this poll is from the Washington Post. Now a democratic politican can use this poll to gain voter s, Polls are like there secret weapon yet it can backfire because not all of America is being polled. Can this be used in an accurate way to determine the U.S. look on Pesident Bush?