Alright, well, I think that I may have solved my problem... Here is what I did:
I wrote a block that uses the captured credentials via the LDAP capture authentication method. In the block I created an image that when clicked on executes a hidden form that passes the credentials to the login/index.php of the second Moodle site. All that the user needs to do is click on a hyperlink (image) of the moodle to which they want to navigate.
Providing that both moodle A and moodle B are authenticating against the same AD, it should work. At least it did work between my sites. Maybe this isn't true/pure SSO, but in the eyes of the end user, they never have to retype in their username and password, so the functionality is basically the same.
I'm open to suggestions/criticism... Is there a better way to accomplish this?