First they won in Buffalo. Now they’ve scored a victory on the other side of the country.On Friday, the National Labor Relations Board announced that workers at a Starbucks in Mesa, Ariz., had voted 25 to 3 to unionize, with three challenged votes. The result brought the number of company-owned stores with a union to three, out of roughly 9,000 nationwide.The victory was the first for the union since two stores voted to unionize in Buffalo in December, but it could mark the beginning of a larger trend. More than 100 Starbucks stores across more than 25 states have filed petitions for union elections, most of them since that first victory. The next tally will probably come from three more stores in the B …
