Overview: Headlines for March 04, 2016; As Romney Warns Trump Will Lead U.S. into Abyss, Challengers Vow to Back Trump If He's GOP Nominee; Is Donald Trump the Charismatic Leader the KKK & Neo-Nazis Have Been Waiting For; 'I Give the Governor Credit': Rubio Praises Snyder's Handling of Flint's Man-made Water Crisis; Remembering Berta Cáceres, Assassinated Honduras Indigenous & Environmental Leader