A government billboard with a photograph of President Daniel Ortega and Rosario Murillo, his wife and co-president, in the Peñas Blancas region of Nicaragua, on Dec. 20, 2018. Ortega said on Sunday that he would abolish his nation’s elections, a blatant move to further strengthen his and his wife’s authoritarian grip on the nation of 7 million. (Meridith Kohut/The New York Times) By JACK NICAS and JAMES WAGNER President Daniel Ortega of Nicaragua said on Sunday that he would abolish his…