Title: Party leaders of the United States House of Representatives
Content:  The floor leaders and whips of each party are elected by their respective parties in a closed-door caucus by secret ballot. The Speaker-presumptive is assumed to be the incoming Speaker, but they have not been formally selected to be nominated for Speaker by the majority party's caucus. After this period, the Speaker-designate is also chosen in a closed-door session by the largest caucus although they are formally installed in their position by a public vote when Congress reconvenes. Like the Speaker of the House, the Minority Leaders are typically experienced lawmakers when they win election to this position. When Nancy Pelosi, D-CA, became Minority Leader in the 108th Congress, she had served in the House nearly 20 years and had served as minority whip in the 107th Congress. When her predecessor, Dick Gephardt, D-MO, became minority leader in the 104th House, he had been in the 
Title: Party caucuses and conferences in the United States Congress
Content:  Members of each major party in the United States Congress meet regularly in closed sessions known as party conferences (Republicans) or party caucuses (Democrats). Participants set legislative agendas, select committee members and chairs, and hold elections to choose various Floor leaders. This process takes place for both the Senate and the House of Representatives. The Republican Conference Chairman or Democratic Caucus Chairman is the third ranking position in each chamber's party leadership, after the Majority/Minority Leader and the Majority/Minority Whip, and before the Campaign Committee Chairman (Democratic Senatorial Campaign Committee, National Republican Congressional Committee, National Republican Senatorial Committee, Democratic Congressional Campaign Committee). In the House of Representatives, if the party has a majority and controls the Speaker's chair, then the Conference/Caucus Chair ranks fourth.
Title: 2017 Micronesian parliamentary election
Content:  The 14 members of Congress are elected by two methods; ten are elected in single-member constituencies by first-past-the-post voting for two year terms. The four at-large Senators are elected on the basis of one from each state, for four year terms Following the elections, the President and Vice-President are elected by the Congress, with only the four at-large Senators allowed to be candidates.
Title: 2015 Micronesian parliamentary election
Content:  The 14 members of Congress were elected in two methods; 10 are elected from single-member constituencies by plurality voting, whilst four senators are elected by the four States. Following the elections, the President and Vice-President are elected by Congress from the Senators.
Title: Structure of the United States Congress
Content:  At the beginning of each two-year Congress, the House of Representatives elects a speaker. The speaker does not normally preside over debates, but is, rather, the leader of the majority party in the House. The Vice President of the United States is, ex officio, President of the Senate. The Senate also elects a President pro tempore. For decades the person elected has been the most senior member of the majority party in the Senate, and has held office until he or she ceases to be a senator or a new president pro tempore is elected (usually after a change in party control). Thus, the Senate does not necessarily elect a new president pro tempore at the beginning of a new Congress.
Title: Party leaders of the United States House of Representatives
Content:  Party leaders and whips of the United States House of Representatives, also known as floor leaders, are elected by their respective parties in a closed-door caucus by secret ballot. With the Democrats holding a majority of seats and the Republicans holding a minority, the current leaders are Majority Leader Steny Hoyer, Majority Whip Jim Clyburn, Minority Leader Kevin McCarthy and Minority Whip Steve Scalise.
Title: Speaker of the United States House of Representatives
Content:  The House elects its speaker at the beginning of a new Congress (i.e., after a general election) or when a speaker dies, resigns or is removed from the position intra-term. Since 1839, the House has elected speakers by roll call vote. Traditionally, each party's caucus or conference selects a candidate for the speakership from among its senior leaders prior to the roll call. Representatives are not restricted to voting for the candidate nominated by their party, but generally do, as the outcome of the election effectively determines which party has the majority and consequently will organize the House. As the Constitution does not explicitly state that the 
Title: Article Two of the United States Constitution
Content:  "Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector." Under the U.S. Constitution the president and vice president are chosen by electors, under a constitutional grant of authority delegated to the legislatures of the several states. The Constitution reserves the choice of the precise manner for selecting electors to the will of the 
Title: United States Congress
Content:  The sitting of a Congress is for a two-year term, at present beginning every other January; the current Congress is the 117th. Elections are held every even-numbered year on Election Day. The members of the House of Representatives are elected for the two-year term of a Congress. The Reapportionment Act of 1929 establishes that they be elected in single-member constituencies or districts by first-past-the-post and that Congressional districts be apportioned to states by population every ten years using the United States Census results, provided that each state has at least one Congressional representative. Each senator is elected at-large in their 
Title: Speaker of the House of Representatives of the Philippines
Content:  When the Office of the Speaker is vacant (usually at the beginning of a new Congress), the Secretary-General of the House sits as the Speaker until a person is elected. A Speaker is usually elected via majority vote via roll call of the Representatives, after nomination at the start of each new Congress. Usually, despite the current multi-party system used, only two representatives are nominated, with nominations being agreed upon before each Congress during caucuses between the administration and opposition coalitions, with the chosen candidate of the majority coalition being almost certain to win by a large margin. The two competing candidates by tradition vote for each other; 

Question: how are leaders of the two parties in congress chosen?
Answer: Senate Republican Conference.
Senate Democratic Caucus.