As Vice President Kamala Harris and former President Donald Trump prepare to square off in Philadelphia for their first presidential debate together following President Joe Biden’s exit from the race, former Gov. Chris Christie (R-NJ) laid out in The New York Times what he thinks Harris has to accomplish in the debate to prevail. Christie previously ran in the primary against Trump but ultimately dropped out. “I don’t have much of an opinion of Ms. Harris yet, because I don’t know her well. If she’s an unknown quantity to me, you can bet she’s also one to the countless everyday Americans she n…