One of the more underappreciated skills that a good recruiter brings to the hiring process is their ability to sell their candidates to the hiring managers.  There have been many times when a candidate that I felt very positive about was initially rejected by the hiring manager.  Many times this is due to the fact that the hiring manager is busy and sometimes not entirely focused on resume review. 

The key to getting that candidate re-reviewed and hopefully interviewed is to present this candidate back to the hiring manager with a concise list of reasons why this candidate should be considered, ideally citing specifics in the resume, pre-interview notes, and the job description to back up your case.

Many times this has led to successful interviews and, in some cases, led to hires.

A great recruiter is a great salesperson!