Yes. Your writings belong to you, not HubPages. Therefore, if you choose to post the same article on another blog site, it is your right to do so. However, one alternative could be to write a counter-argument to the original article, or about something relatively similar. Then, in the second post, you could provide the link to the original post on HubPages. This would alleviate any ethical ambiguities while generating traffic for both articles. Good Luck!