Two Democratic strategists made each other and a CNN host laugh Wednesday as they laid into J.D. Vance and Donald Trump ahead of next week’s debate — with one saying Vance gave Trump a “dead cat bounce” and the other saying Trump will bring a playbook as “stale” as an eight-year-old, sun-soaked milk carton. James Carville and Paul Begala, who helped President Bill Clinton’s 1992 presidential campaign, joined CNN’s “OutFront” with Erin Burnett to talk about the upcoming Sept. 10 debate, with Carville saying he fully expects Vice President Kamala Harris to “drag” Trump “all across the debate pla…