The word "whip" is used figuratively in the sense of "driver, overseer". The whip's role is to ensure party discipline; that is, to make sure that party members vote in accordance with official party policy. They can offer inducements (such as promotions to important committees) or threaten punishments (such as removal from important committees or withdrawal of party funding for a reelection campaign) to party members who seem likely to vote otherwise.
Technically, a quorum must be present for the house to "do business", but it's policy in both houses to assume that a quorum is present unless a "call for quorum" is specifically requested; it's therefore possible for debate to continue even if some (or even most) of the members leave the chamber. Another of the whip's jobs is to "round up" his party's members and get them back into the chamber when it's time to vote.
The position has no official standing under the Constitution (it's strictly up to a party whether they want to have a whip or not), and was first established around 1900.
The "minority whip" is the whip for the minority party in that house of congress (it's quite possible, and in fact is often the case, that the Minority Whip in the House of Representatives and the Minority Whip in the Senate are members of different parties). Technically, there could potentially be several "Minority Whips", but in practice minor parties (i.e. those other than Democrats or Republicans, currently) generally don't bother, since they don't have enough members (it's rare for there to be even ONE member of a minor party in office, so he'd be his Party Leader and would also have to do the job of his Party Whip ... making sure that he was present for the vote, and threatening himself to get him to vote properly).
As of April 2014, there are no members of the House that are not either Republicans or Democrats (the Tea Party is basically an ideological position within the Republican party rather than an actual party in its own right), and only two Senators who are neither Republicans nor Democrats (officially both are independent and not members of any party; in practice they nearly always vote with the Democrats).
The leader of a minority party is called the minority leader (House Minority Leader and Senate Minority Leader). The whip(in the majority or minority party) is the leader's deputy who serves as the assistant floor leader. The party's whip has the job of watching how the party members vote on bills, persuading the members to vote as the party wishes, and seeing that the members of that particular party are present on the floor to vote.
As of the 113th US Congress (2013-2015), the US House of Representatives Minority Whip is Democrat Steny Hoyer of Maryland's 5th District.
House Leadership: Majority Party Speaker of the House Majority Leader Assistant Majority Leader Majority Whip Minority Party Minority Leader Assistant Minority Leader Minority Whip Senate Leadership President of the Senate is the Vice President of U.S. President Pro Tempore--Senator of the Majority Party with Seniority Majority Leadership Senate Majority Leader Assistant Senate Majority Leader Senate Majority Whip Minority Leadership Senate Minority Leader Assistant Senate Minority Leader Senate Minority Whip
Republican Mitch McConnell of Kentucky is the current Minority Leader of the United States Senate .
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Minorty Whip
(Senate majority whip)
Minority Whip for senate 2010: Jon Kyl (Republican)
Johnstone Muthama of CORD is the current minority chief whip in the senate of Kenya.
Hassan Abdurrahman is the current deputy minority chief whip in the senate of Kenya.
Jon kyl
Congressional leadership is a follows: House of Representative: Speaker of the House Majority Leader Minority Leader Majority Whip Minority Whip Senate: President of the Senate (vice president of the U. S.) Majority Leader Minority Leader President pro tempore of the Senate Assistant Majority Leader (Majority Whip) Assistant Minority Leader (Minority Whip)
Jon Kly (Republican)
Jon kyl
Dan Handson
current minority leader in senate
In the House of Representatives, the Whip is Eric Cantor of Virginia. In the Senate, Jon Kyl of Arizona is the Minority Whip.
Beatrice Elachi of Jubilee coalition is the current majority chief whip in the senate of Kenya.
Jakoyo Midiwo of the CORD coalition is the current deputy minority chief whip of the 11th parliament of Kenya.