With very serious issues like gun control, Russian tampering, prison reform and health care, it’s unlikely that a narrow issue like a candidate’s stance on nuclear power will sway anyone about voting for them or not. Even if it is part of the more overall critical issue of energy and climate.
But it is good to know which candidates just accept fear-mongering over science or actually care to understand a scientific issue by talking to scientists in that field.
The Green New Deal has become a significant talking point in the 2020 Presidential election. Republican leadership and the President just mock it, but most Democrats, with several exceptions, support some form of it.