Looking for MU Polls Plugin (PoWPoll Error)

Anyone have a recommended Polls plugin that will let MU blogs create their own polls in their posts or pages? I enable plugins for Supporter blogs and have been asked for a Polls feature.

I activated PoWPoll for WPMU 2.7 from WPMU Dev but it throws the following error below when trying to add an option to a poll. (I couldn't find anywhere to comment on the plugin over there, so I'm asking here.)

Fatal error: Call to a member function add_option() on a non-object in /home/rvblogs/public_html/wp-content/plugins/PoWPoll/ajx.php on line 31