David Lenihan is the latest guest on Politically Speaking, where the GOP candidate talked with St. Louis Public Radio’s Jason Rosenbaum on his candidacy for the 1st District Missouri Senate seat.Lenihan is running against Democratic state Rep. Doug Beck in the district that takes in parts of unincorporated south St. Louis County, Crestwood, Maplewood and Webster Groves. That part of St. Louis County has typically been competitive.