gdm blocking root login

[Heitzso]

I'm running debian unstable and sometime in
the recent past (few months?) gdm stopped letting
me login as root to X.

I understand that there might be security benefits
to blocking root's logging onto X, but it keeps
me from easily using the GUI admin programs.

Clues re how I can reconfigure my system to
let root logon to X via gdm?

Thanks!
Heitzso