This is a scaled claim. YES coupons pay (2047-X)/50, subject to a maximum of 1 and a minimum of 0, where X is the first year, 1995 or later, in which the Democratic Party controls the U.S. House of Representatives. Thus, if Democrats control the House in 1997 or sooner, YES coupons pay 1, while if they do not control the House until 2047 or later, YES coupons pay 0.
The Democratic Party is said to control the House of Representatives when there are more Representatives belonging to the Democratic Party than Representatives belonging to all other parties and independents combined. Vacant seats are not counted towards this total.
If the Democratic Party changes its name before it controls the House, YES coupons pay 0.
Note that at the time of creation of this claim, members of the U.S. House elected in November do not take their seats until the following January. Thus, (barring any changes to this procedure), if Democrats first won control of the House in the November 2006 election, they would not actually have control until January 2007, and YES coupons would therefore pay 0.80, and not 0.82.
I will judge based on the intent of this claim, if I perceive such intent to be obvious. If such intent is ambiguous I will judge on the basis of the precise wording. If both are ambiguous, I will look for a solution which follows IF/FX precedent insofar as such precedent is apparent to me and applicable to the claim. I will seek the guidance of the claim's owner/author in interpreting the claim. It's his or her question - s/he ought to get the answer sought. If I believe this claim to have met a YES or NO condition, and if I believe judgement will be controversial, I will post a prospective judgement to fx-discuss and forestall entering the judgement for a comment period to be announced in the post.