to enter into politics
vstoupit do politiky
John Morton was reared on a farm, yet with the help of his stepfather, he became a surveyor before he entered into politics. (Google)
It was only at the age of forty, however, that he entered into politics as a member of the city's board of alderman. (Google)
She herself "entered into politics not because of feminism, but because my husband was in politics and encouraged me to join. I wanted to be useful to people." (Google)