on the newshour tonight, naftali ben david of the "wall street journal" looks at the shift in momentum as key republican senators lined up behind ratification. >> ifill: then, carl dinnen of independent television news has the latest on europe's travel troubles as some airports struggle to cope with unusually wintry weather. >> woodruff: there are more americans than ever living in different places. we look at new numbers with census director robert groves, and at the political fallout with david chalian and stuart rothenberg. >> ifill: ray suarez continues his reporting from havana. tonight he examines the cuban health care system's emphasis on preventive medicine. >> suarez: in a country with a struggling economy and very little money to spend on health care, they achieve some of the best results had the world. >> woodruff: and jeffrey brown talks to cecilia kang of the "washington post" about the federal communications commission's new rules for internet providers. >> ifill: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: >> opportuni