Up or down vote
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An up or down vote refers to a direct vote in the U.S. House of Representatives or the U.S. Senate on an amendment or bill; it is sometimes referred to as a "clean vote". Members vote yea or nay on the matter rather than voting on a related procedural maneuver. Depending upon the rules of order for that particular type of amendment or bill, the vote required for passage might be a 2/3 majority, a 3/5 majority, or a simple majority.
The phrase is probably most often used by those who are frustrated by opponents in the House or Senate who delay a bill indefinitely by means of various tactics. The rules of the House and Senate allow a bill to be delayed — including "delayed permanently" — by various means, such as to table the bill, to recommit it, or to amend it in the second degree. By appealing for an "up or down vote", an advocate of the bill is trying to get it out of committee and past all other legislative hurdles, and to a floor vote.
In 2005, the phrase was heard most often from Republicans in the United States, who occupied 55 seats in the United States Senate, and thus lacked the 60 votes required to overcome a filibuster maneuver by the Democratic Senators. Because of this, a united Democratic bloc was able to filibuster any objectionable bill, Presidential appointment, or other matter before the Senate, and prevent passage. If the Republicans were able to bring any particular matter to an "up or down vote", they would be able to approve that measure if voting as a bloc.
To this end, many Republican-affiliated websites and political action committees had urged voters to demand of their Senators and Representatives an "up or down vote" on various issues. Constitutionally, however, the Senate is not obliged to give any matter an up or down vote.
Since taking control of the U.S. Senate in 2006, Democrats have accused Republicans of filibustering almost every proposal, and, hence, requiring 60 votes to pass any legislation (e.g., the American Recovery and Reinvestment Act, the Patient Protection and Affordable Care Act, and the Dodd-Frank Wall Street Reform and Consumer Protection Act). (Republicans set a record for the most number of filibusters during the 111th congress.)
See also 
-  - CSPAN definition