The existing polls (started before 1/20/05) will show who voted because hiding such is a setting when posting the poll and since all the existing polls didn't have such a setting they will by default show who voted.

In moving forward, I encourage all future posters to select the "hide who voted" option to get a better response.

If your not sure if your vote will be shown, there will always be a disclaimer above the poll options that says:

Be advised that this is a public poll: other users can see the choice(s) you selected.
... if the "hide who voted" option was not selected.