
A general election matchup between Donald J. Trump and Hillary Clinton became all but certain on Tuesday after Mr. Trump’s decisive victory in Indiana. He would begin that matchup at a significant disadvantage.
Yes, it’s still a long way until Election Day. And Mr. Trump has already upended the conventional wisdom many times. But this is when early horse-race polls start to give a rough sense of the November election, and Mr. Trump trails Mrs. Clinton by around 10 percentage points in early general election surveys, both nationally and in key battleground states.