Possible to modify the RSS entries with Plugin API?

Hi there!
The title might be a bit confusing. Anyway here’s a better explanation. I’m the developer of a WordPress plugin called Emo Vote. I’m want to take it to the next level by allowing “emoting” by RSS. I simple want to add a p-element with some links inside the content-element (<content:encoded></content:encoded>)in each RSS-item. I looked briefly at the action reference and couldn’t find anything that fills my needs. So as you might have guessed already, is there a way to “inject” the content in each RSS-item?

Thanks in advantage!