Offer workflow ties to Req-specific workflow?

Summary

Offer workflow ties to Req-specific workflow?

Content

Is it possible to automate the changing of a candidate's requisition-specific candidate status based on an action taken in the offer workflow? 

Specifically, I want a candidate's requisition-specific candidate status to automatically change to "Offer Extended" when an offer has been emailed to a candidate. 

I looked at both workflows and couldn't see a way to do it. If this isn't possible, is there another way to do it?