by jason everling.
You can use the below to login as the site admin using,
http://URL TO MOODLE/login/index.php?username=adminusername
If using https for logins, add https to the beginning, if not then you will still get redirected to CAS.
This will bring up the manual login page, hopefully you left the admin account as a manual account.
If you did change it, post back here, you can also go into the database and change it back manually.
JASON