(CNN) -- Vincent Harris, Ted Cruz's top digital operative, is leaving the Texas senator's team to work for Sen. Rand Paul's political operation, as the jostling for staff ramps up ahead of the 2016 GOP presidential primary contest. Harris will join Rand Paul's political action committee and his 2016 team as a chief digital strategist, according to Doug Stafford, executive director of RAND PAC. Stafford said Harris will sit at the "top of the leadership team," as Paul and his inner circle carry out what's expected to be a dizzying political schedule. Paul will likely announce his Senate re-election bid...