Hillary Clinton has opened up a big lead in Wisconsin over Donald Trump in a new Marquette Law School Poll.
The numbers are not good for Donald Trump. He's losing to Hillary Clinton by 15 points, 52% to 37% among likely voters - meaning those who say they are certain to vote in November.
Trump's current polling, below 40% in the state, also reflects his defeat in April to Ted Cruz. But is there any evidence to suggest that there is hidden support for Trump that's not showing up in the polls?
"If we look at the primary election polling, which are Republican voters through the year, there's not much evidence that Trump is substantially underperforming his polling average going into each of the primaries," said Marquette Law School Professor Charles Franklin.