The few undecideds tilt toward Hayes.
Only 5% of voters in our survey say they are undecided on the HD-143 race, a relatively small sample size. But there may be good news for Hayes in this group: 49% say they disapprove of Trump, while just 26% approve. And none of the undecided voters say they plan to vote for Garrity in the gubernatorial race, while 47% say they'll vote for Shapiro and the rest say they don't know. Given the small sample size, though, these numbers should be taken with a grain of salt, but there's other indications that undecideds might ultimately lean a bit more Democratic. For example, none of Garrity's voters are undecided in the House race, while 4% of Shapiro's are.
State Navigate - Pennsylvania HD-143 poll briefing - PDF page 8.