After my post on Friday regarding the extent to which each candidate supports the full body of stem cell research, Mark Schmitt pointed out to me that the McCain campaign has just released a radio ad called "Stem Cell." Here is the script which, notably, does not explicitly specify whether it's referring to embryonic or adult stem cells:

They are the original mavericks. Leaders. Reformers. Fighting for real change.

John McCain will lead this Congressional allies to improve America’s health.