Text editor that can edit using sudo over ssh?

I'm trying to edit files on a remote Amazon EC2 Linux instance. I'm currently just sshing in and using nano, but would really like a graphical text editor. I have two problems:

1. I have to use sudo to edit these server files when I ssh in.
2. I can only login with the key Amazon gave me. Ex: ssh -i Andrew.pem ec2-user@55.55.44.33

Please help! I'm not picky, just any graphical text editor since using nano is a huge pain.