[cmptrgy412]

I'm not logged into linux right now, and a bit too lazy at the moment, but if you want to actually log in as root, somewhere in the properties, it has the option to allow root login... I'll look that up in a while and edit this post.

[edit]
Yeah, it's under login window preferences.
System->Administration->Login Window
Click the security tab.
Click checkbox in allow local system administrator login.
Now you can login as root.

Just remember, you shouldn't use root as your default user and in fact should use sudo for installing packages, but this is just for reference.
[/edit]