Even though the Roman Republic contributed significantly to many aspects of democracy, only a minority of Romans were citizens with votes in elections for representatives. The votes of the powerful were given more weight through a system of gerrymandering, so most high officials, including members of the Senate, came from a few wealthy and noble families. In addition, the overthrow of the Roman Kingdom was the first case in the Western world of a polity being formed with the explicit purpose of being a republic, although it didn't have much of a democracy. The Roman model of governance inspired many political thinkers over the centuries, and today's modern representative democracies imitate more the Roman than the Greek models because it was a state in which supreme power was held by the people and their elected representatives, and which had an elected or nominated leader.