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Exclusively for WisPolitics Subscribers From WisPolitics.com ... -- Senate candidates Kevin Nicholson and Leah Vukmir today agreed to sign a unity pledge from the Wisconsin GOP so they'll be eligible to win the party's endorsement at the state convention in May. Meanwhile, former UN Ambassador John Bolton's super PAC is planning a $1 million buy to back Nicholson, who is bringing on Ted Cruz's f...