brett mcgurk, special presidential envoy, you're off the saudi arabia later today. where president obama will be. thank you very much for joiningf us. >>ni judy, thank you so much. great to be here. >> sreenivasan: now, for more on today's empire state primaryat we're joined by tamara keith of n.p.r. who is in new york city tonight, and in albany is karen dewitt, capitol bureau chief for new york state public radio. first, am the a, let me start with you. what are you looking for tonight? >> i'm looking for a margins of victory. donald trump is in search of a clean sweep of delegates. the only way he can get there is if he can get more than 50% of the vote. and on the democratic side, hillary clinton is widely expected to win here. bernie sanders' campaign is sending around an e-mail talking about how in 2008 she beat president obama by 17%, which seems to be setting up a question of what the margin would be this time. sanders is expected to do better than that. he's expected to keep it relatively close. the question is just how close. >> sreenivasan: karen, how abo

brett mcgurk, special presidential envoy, you're off the saudi arabia later today. where president obama will be. thank you very much for joining us. >> judy, thank you so much. great to be here. >> sreenivasan: now, for more on today's empire state primary we're joined by tamara keith of the in albany is karen dewitt capital bureau chief for new new york state public read oh. welcome to you. if you are the results that we know at this point. the associated press predictse donald trump has a resounding trick tree 59% to kasich 19 and it's too soon to call the democratic race between hillary clinton and bernie sanders. so let me start with you first. what do you read from the exit polls. >> what we see it's very interesting. the gop says they're divided. these people were asked, do youu feel like the campaigns have divided you or energized you. on the gop side 57% said divided. on the democratic side 68% said energized. that's fascinating to me. 26% of the republicans said they would they are vote for trump. with hillary clinton, 85% of democrats said they would vote

. >> woodruff: plus, a conversation with special presidential envoy brett mcgurk on the decision to sendt u.s. troops to iraq. >> sreenivasan: and many american schools have a growing problem with lead contamination. why are districts across the country struggling to provide clean drinking water? >> the nature of the beast is that lead levels in water are unpredictable and exposure iss really like a russian roulette.