A big endorsement, a criminal charge on the campaign trail

Aired: 3/29/2016 | 0:04:18 | Clip
The presidential candidates turned their attention to Wisconsin, site of the primary season's best big contest. Gov. Scott Walker endorsed Sen. Ted Cruz, who in turn launched another round of criticism against Donald Trump. But recent polling shows that Trump and Ohio Gov. John Kasich are in a statistical tie. Gwen Ifill reports.