Joe Biden Faces Tough Road to White House, Starting With Iowa

As vice president considers a 2016 bid, Hillary Clinton and Bernie Sanders gather staff, support

By

Peter Nicholas And

MINNEAPOLIS—As Vice President Joe Biden weighs a presidential bid, he must confront a number of fundamental questions. Among them: Does he have a viable path through an electoral map that is becoming only more treacherous the longer he stays on the sidelines?

Polling shows that Democratic front-runner Hillary Clinton’s candidacy has been weakened by a lingering controversy over her email practices as secretary of state, fueling...