Political analysts noted a big difference Monday between the campaigns of Donald Trump and Kamala Harris: the use of surrogates to travel the country and promote the candidate. Speaking to MSNBC’s “Deadline White House,” former Sen. Claire McCaskill (D-MO) quipped: “What, you guys don’t think Kid Rock is good enough? I can’t figure that out.” New York Times editorial board member Mara Gay explained that Democrats have a “deep bench” of potential candidates — but the GOP can’t say the same. She explained that there’s no better example than those who spoke at last week’s convention. Want more br…