Wouldn't on the next indexing of your site Google and other search engines re-index this same exact content as a newer date and then, upon repetition of this happening, say: "hmmm, looks like they're just spinning the same content with newer dates, let's give them demerit points." (that's the Google search indexing algorhythm thinking to itself)
There are some plugins that run top-clicked or most-commented posts in your sidebar. Outside of that, I think the best way to really promote an old post is to revisit the topic, update the information at the top of that one, or in a new one that links back to that one, which let's people know it's a series of content.