Formal:
* A caucus: This is a common term used for a group of politicians with similar views.
* A delegation: This is used for a group of politicians representing a particular organization or country.
Informal:
* A pack: This implies a group of politicians working together, perhaps in a less than honorable way.
* A swarm: This suggests a large, chaotic group of politicians.
* A gaggle: This is a playful and slightly derogatory term for a group of politicians.
Humorous:
* A parliament: This is a play on the name of a legislative body.
* A cabinet: This is a humorous reference to the group of advisors to a head of state.
Ultimately, the best collective noun for politicians depends on the specific situation. You can use your creativity to choose a term that best fits the context.