Christopher Bancroft, a member of the family that controls Dow Jones & Co., the parent of The Wall Street Journal, is engaged in a last-ditch effort to thwart the acquisition of the company by News Corp. CEO Rupert Murdoch, writes three Journal reporters for Monday's paper. Susan Warren, Sarah Ellison and Dennis Berman wrote, "His idea is to buy more 'supervoting' shares from other Bancroft heirs who may be ready to sell their stakes but share his distaste for delivering the family legacy into the hands of Mr. Murdoch. "Those supervoting rights give family members 10 votes for every one share — compared with one vote for common shareholders. They lose their supervoting status once sold, unless they are transferred to other family members. To ensure he would be able to block a deal, Mr. Bancroft would need to get 51% of the total votes of the company to vote against a deal, or about $2.55 billion at $60 a share.