Although you can create the poll with two radio buttons they do not show as vote up and vote down buttons. They show as simple radio button options. However with some clever CSS styles, you can show them as buttons as you like. A sample example is given below.
corejoomla.com is not affiliated with or endorsed by the Joomla! Project or Open Source Matters. The Joomla! name and logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.