Using sudo in GNOME on Scientific Linux

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http://unix.stackexchange.com – In Debian-derived Linux distros, if you are not root but are authorized in /etc/sudoers, GNOME will ask you for your own password to allow privileged operations. However, Scientific Linux asks you for the real root password, even if you can run programs with sudo. A Google search suggests this is true for all Red Hat or Fedora-derived distros, but the suggested solutions are all very old, complex, and not very complete. How should I configure GNOME, or kernel PAM, or what-have-you to let me use sudo properly within the GNOME GUI? (HowTos)