from the tisch wnet studios at lincoln center in new york, alison stewart. >> stewart: good evening and thanks for joining us. ohio received the bulk of candidate attention today, as it and four other states: florida, illinois, missouri, and north carolina, prepare to hold presidential primaries on tuesday. on the republican side, ohio governor john kasich and florida senator marco rubio campaigned in their delegate rich home states, hoping to thwart businessman donald trump and texas senator ted cruz, who are well ahead in delegates needed to win their party's nomination. yesterday, rubio and kasich split the delegates at the washington, d.c. convention: rubio narrowly won and earned 10 delegates, and kasich placed second taking nine. in wyoming, cruz easily won the state convention and nabbed nine of the 11 delegates, followed by rubio and trump with one each. overall, trump leads the republicans with 460 delegates, almost 40% of the number needed to win the nomination, while cruz has 369 delegates, rubio has 163, and kasich, 63. cruz said today his party should not fear if no one can

from the tisch wnet studios at lincoln center in new york, alison stewart. >> stewart: good evening and thanks for joining us. wheels down in havana for air force one, as barack obama becomes the first sitting u.s. president to visit cuba since calvin coolidge almost 90 years ago. the president will spend a busy two days on the communist-ruled island nation. >> reporter: only eight months after the flag was raised at the reopened u.s. embassy in cuba, for the first time in more than half a century, the streets of havana are decorated with american flags and images of president obama. the president and the first family are beginning their cuban visit with a walking tour of historic old havana tonight. mr. obama will meet tomorrow with cuban president raul castro and attend a state dinner. obama has no plans to meet with former president and revolutionary leader fidel castro, older brother of the current president. but he does intend to spend time on tuesday with critics of castro's government, many of whom have faced arrests for their outspoken opposition. the white house would not discl

i am alison stewart. good night. captioning sponsored by wnet captioned by media access group at wgbh access.wgbh.org >> pbs newshour weekend is made possible by: lewis b. and louise hirschfeld cullman. bernard and irene schwartz. judy and josh weston. the cheryl and philip milstein family. the citi foundation. supporting innovation and enabling urban progress. the john and helen glessner family trust. supporting trustworthy journalism that informs and inspires. sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. exexplore new worlds and new ideas through programs like this. made available for everyone through contributions to your pbs station from viewers like you. thank you. yanni: on november 14, the year 2015, i brea

in tonight's "signature segment," special correspondent alison stewart reports on how exposure to opioids affects newborns, and how these babies and mothers are getting help. >> stewart: to the trained ear, the high-pitched cry of this three-week-old baby girl is a sign that something isn't right. nurse heather mishlick at east tennessee children's hospital is taking care of her. >> if you just kind of walked by a baby and you didn't know what was going on, those would be the things that popped out to you the most, like, you know, why is that baby crying so loud? you know, why is that baby shaking? and you know, why can't we console that baby? >> stewart: the answer is the infant is going through withdrawal from prescription opioids that her mother took while pregnant, leading to a condition called neonatal abstinence syndrome, or n.a.s. >> their temperatures are high. their extremities are really stiff. there may have been feeding problems initially. >> stewart: this baby's mother, who we will refer to as katie-- which is not her real name, she asked to remain anonymous-- says her daught

in tonight's signature segment, newshour special correspondent alison stewart went to minnesota and wisconsin to compare the different systems. this story is part of our ongoing series about poverty and opportunity in america called "chasing the dream." >> hello, gentlemen. how are you today? >> reporter: lesa melby has been a waitress at grandma's restaurant company in duluth, minnesota, for 34 years. how many tables can you handle comfortably? >> kind of a lot. >> reporter: a lot? how many? >> i can comfortably do probably nine. >> reporter: wow. that's impressive. melby relies on tips as a core part of her income, but she also gets paid minnesota's state minimum wage of $9 an hour. if you have a day when you get completely stiffed on tips, you will still take home your minimum wage. >> right, right. >> reporter: the federal minimum wage is $7.25 an hour, but, in 43 states, employers are allowed to pay tipped workers less-- some as little as $2.13 an hour, a federal wage which has not increased in 25 years. the rationale is that customer tips are supposed to make up the difference between $

and alison stewart has a preview of what's coming up on tomorrow's edition of pbs newshour weekend.businesses struggle to strike a balance between wages and tips. >> sundays, the tips are amazing. but then there is other days that i'm making nothing. >> on the next pbs newshour "weekend." >> woodruff: that's tomorrow night, on pbs newshour weekend. and we'll be back, right here, that's the newshour for tonight. i'm judy woodruff. have a great weekend. thank you and good night. >> major funding for the pbs newshour has been provided by: >> fathom travel-- carnival corporation's small ship line. offering seven-day cruises to three cities in cuba. exploring the culture, cuisine and historic sites through its people. more at fathom.org. >> lincoln financial-- committed to helping you take charge of your financial future. >> bnsf railway. >> genentech. >> and the william and flora hewlett foundation, helping people build immeasurably better lives. >> and with the ongoing support of these institutions >> this program was made possible by the corporation for public broadcasting. and by con