Unable to run graphical program as root.

[Cobalt]

When attempting to run a graphical program as root from the terminal, I get this error:

No protocol specified

** (gedit:5165): WARNING **: Could not open X display
No protocol specified
Failed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(gedit:5165): Gtk-WARNING **: cannot open display: :0

When attempting to run a graphical program as root using gksu, nothing happens

Release: Lubuntu 15.10
gksu version: 2.0.2-9ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: gksu 2.0.2-9ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: LXDE
Date: Thu Nov 26 15:46:37 2015
JournalErrors:
 No journal files were found.
 -- No entries --
SourcePackage: gksu
UpgradeStatus: No upgrade log present (probably fresh install)