The New York Times had a summary of reader letters on polling. See
“Margin of Error: The Perils of Polling”
“Readers discuss why polling so often fails to predict elections”
You have two ways to screw up polling:
1) Never respond to a poll.
2) Always vote.
Remember that a poll is not an election. And there are several instances of polling being off the mark. One was Dewey was predicted to beat Truman in 1948. A second was the 1998 polls for Minnesota Governor ranked the candidates as Humphrey, Coleman, and Ventura. The actual vote was just the reverse!
If your candidates are ranked low in the polls, be sure to vote. They need every vote they can get.
If your candidates are ranked high in the polls, be sure to vote. Polls have been wrong and the candidates might need every vote they can get.