You don't have to ask a specific moderator. Just go to your User CP, then to group memberships, and there should be the option to request permission to join the group for the political forum.
Wear your boots
Tom Servo (10-17-2013)
When all is said and done more is said than done.
There is also a stickied post in the Non-Baseball forum that outlines what Larkin Fan summarized above.