Sen. Tom Cotton (R-AR) reportedly used a private Republican lunch this week to caution his colleagues against talking to the press — a warning that, within a day, leaked to the press.Politico's Jordain Carney reported Wednesday that Cotton, "per multiple attendees," delivered a speech at Tuesday's GOP lunch "warning against talking to reporters." The senator, Carney noted, already "has a blanket no-comment policy in the halls." Colleagues told h…