The Largest Party denotes the party with the most seats in the electoral body (Parliament, House of Representatives, etc). Thus, this party has a great deal of influence in the government, possibly despotic.
Hint : Remember, even the Largest Party started with 0 seats as well. See where the people of your nation stand, calculate that to where you stand, and then take action. Make sure the People know with perfect clarity where you stand on important topics.