You'll find wording such as "fairness, equal treatment, dignity, respect and service." When it comes to why you had to arrest this person, you were following the core values and fairness. You could not allow this subject to walk away because of who his/her daddy might be, could you?
A big hint here is be you, act professionally. Once you confirm that you have a major player that could be on the 6 o'clock news, notify your supervisor immediately. Put the process on them. You've made your notification. Let the games begin.
If you have any calls or media contacts regarding this, again follow your procedures. Don't give a reckless "off the record" statement. There's no such thing as off the record with the media in a tabloid environment story. Refer statements in accordance to your policy.
Don't ever allow yourself or others to shoot a few camera phone photos for giggles. If this leaks out, start filling out applications somewhere far, far away. You're done in this town.
Don't ask for autographs and souvenirs. Do you really want to remember the night that you OC sprayed a senator?