Majority Leader: In the various states, the majority leader of a state legislative chamber usually performs a similar role to the Majority Leader of the United States House of Representatives.
Minority Leader: In U.S. politics, the minority leader is the floor leader of the second largest caucus in a legislative body.
Whip: Assistants to the floor leaders who are also elected by their party conferences
Pro Tempore: That means that he's been transformed overnight from a minority-party graybeard to third in line to the presidency
Speaker of the House: The Speaker of the House is the presiding officer of the United States House of Representatives.