My dear, Somertime.
It is very easy.
At the time of publishing your hubs, there are several capsules on the top right corner, the capsules say, "text", "photo", "News", "Video", "poll", "rss" etc.
Simply click on the option of "poll".
Adjust the capsule wherever you want and then add a question along with the options you want and 'save'.
Viola, you have a voting poll. :)
I hope this helped. :)