If you set up a poll on your Drupal site and intend to get votes from both anonymous visitors as well as from authenticated users, you need to make sure that "vote in poll" action is permitted for them.

To do this, go to Administer -> Permissions and scroll down to poll settings.

In the same way, search action is also disabled by default. So you if want visitors to your site to be able to search for content, then you need to enable it.