There are some obvious reasons to me:
- Long campaign hours — Same as workaholics, being away from home offers a lot of opportunity for philandering.
- Lots of people interaction — When campaigning and legislating, you deal with a lot of people.
- Charismatic, passionate leaders — Elections attract people who often have the attractive qualities.
- Sense of entitlement — Those who do good, big work (like legislators) can easily convince themselves that they’re owed a little wrong.
- You’re the boss — In interviews and campaigning and voting and such, legislators are taught to make and stand by their decisions. Not all of them are the right ones.