The landmark case, Marbury v. Madison in 1803, is argued to be the most important court case in United States History. Federalist candidate John Adams was upset in the presidential election by Democratic-Republican candidate Thomas Jefferson. Amidst the chaos of the Federalists being defeated and a new political party taking over the executive branch, Adams began appointing many justices of peace. When Jefferson’s Secretary of State, John Madison, did not deliver the commissions, William Marbury tried to get the court to write a writ of mandamus to force him to do so. In this case, Supreme Court Justice, John Marshall, arguably the most influential judge in United States history, established the principal of judicial review. This process gives a court the right to declare laws unconstitutional if they go against what is dictated in the constitution. This is incredibly influential as a part of United States history, politics of the present day, and even politics of the future. This case is applies checks and balances to the government and equalizes the judicial branch with the powers of the executive and judicial branches. This protects the citizens of the United States against having too large and powerful of a national government. It is fascinating that even today, we can use the process of judicial review that was established in 1803 in order to stay true to the Constitution.