Donald Trump is expected to win all five northeastern states holding GOP primaries today, likely taking close to 110 of the 118 bound delegates up for grabs. His total delegate haul could drop to 95 or so if he unexpectedly fails to win 50 percent of the statewide vote in Connecticut and if he loses two or three congressional districts in Maryland.

But the real race to watch is Pennsylvania, where an additional 54 unbound delegates are up for grabs. These delegates are elected directly on the ballot, but the ballot does not say which presidential candidates they support. The Republican National Committee rules allow unbound delegates to vote for whichever presidential candidate they prefer, but some delegate candidates have already announced which candidates they back, while others have said they’ll back or at least consider backing the candidate who wins the popular vote in their district. Some have declined to say how they’ll vote.