amy: we will speak with a member of the federal election commission, ellen weintraub. she is calling for greater enforcement of campaign finance regulations. her latest piece in the "new york times" is headlined, "taking on citizens united." all that and more, coming up. welcome to democracy now!, democracynow.org, the war and peace report. i'm amy goodman. it's primary day in wisconsin. polls suggest it could be a big day for the underdogs as democratic contender bernie sanders and republican ted cruz have seen a surge in support in recent weeks in the badger state. after wisconsin, the next big state on the primary calendar is new york. on monday, hillary clinton and bernie sanders have agreed to hold a debate in brooklyn ahead of the april 19 primary. it will be april 14. meanwhile, the latest fundraising numbers show sanders, who has won five of the last six contests, raised a record-setting $44 million in march. clinton took in $29.5 million. in republican news, the huffington post is reporting billionaire gop donor charles koch is privately predicting house speak