He is deeply involved in politics.

They are my best friends.

He is participating in a fierce competition.

They got involved in an argument about politics.

They argued fiercely about politics.

Seiji is my best friend, he is always a fair and just person.

They are my best friends.

He is majoring in political science at university.

I think he is a competent politician.

Aristocracy was a major form of politics in medieval Europe.