Minority Leader: Harry Reid
He has to enforce party discipline on votes deemed to be crucial by the party leadership and to ensure that members do not vote against the position of the party leaders.
Majority Leader: Mitch McConnell
He is the chief spokesperson for the majority party.
Speaker of the House or Assembly:
To plan and implement the legislative agenda of the House. To preside over the House, choosing which Members to recognize during floor debate and ruling on points of order and maintaining decorum.
Majority & Minorty Leader:
They're responsible for mobilizing votes within their parties on major issues.