US presidential primaries spark back to life Tuesday after an eventful 10-day break with clear frontrunners Donald Trump and Hillary Clinton both facing the real possibility of losing in Wisconsin.
Defeat in the north-central state isn't likely to immediately change the course of the overall nominating contest, but it could serve as an indicator of the race's current status ahead of the New York primary on April 19, where polls show both in the lead. It's been a bumpy period for Trump, the Republican billionaire from New York.
Although his campaign has seemed bulletproof up until now, his latest controversies -- including abortion, opponent Ted Cruz's wife and a journalist who said she was roughed up by Trump's campaign manager -- have alienated women voters further, polls indicate.
His divisive style is also under scrutiny, and the real estate magnate had a surprise meeting with Republican party chief Reince Priebus in Washington on Thursday amid rumblings that the party would fracture if he were to win the nomination.
With polls for the Wisconsin Republican primary showing the ultraconservative Cruz holding a 10-point lead, Trump has launched a series of events in the heartland state to rally support. Moderate John Kasich, the Ohio governor, is polling third and last.