Sentence:  When the votes were counted, the <WSD>superminority</WSD> resolution revoking the pledge took 37 percent, but backers of the pledge also failed to win a majority, so the UAW found itself with no formal position on the crucial issue. 
Meaning of the word marked with <WSD> tags:  A voting block which, although it has less than 50% of the vote, has sufficient numbers to prevent any other group from forming a supermajority.