United States presidential primary
There is no provision for the role of political parties in the United States Constitution, since the Founding Fathers did not originally intend for American politics to be partisan. In Federalist Papers No. 9 and No. 10, Alexander Hamilton and James Madison, respectively, wrote specifically about the dangers of domestic political factions. Thus in the first two presidential elections, the Electoral College handled the nominations and elections in 1789 and 1792 that selected George Washington. The beginnings of the American two-party system then emerged from Washington's immediate circle of advisors. Hamilton and Madison, who wrote the aforementioned Federalist Papers against political factions, ended up being the core leaders in this partisanship: Hamilton became the leader of Federalist Party while Madison co-helmed the Democratic-Republican Party with Thomas Jefferson.
The Federalist Papers
"The Federalist Papers" (specifically Federalist No. 84) are notable for their opposition to what later became the United States Bill of Rights. The idea of adding a Bill of Rights to the Constitution was originally controversial because the Constitution, as written, did not specifically enumerate or protect the rights of the people, rather it listed the powers of the government and left all that remained to the states and the people. Alexander Hamilton, the author of Federalist No. 84, feared that such an enumeration, once written down explicitly, would later be interpreted as a list of the "only" rights that people had.