No, I'm not being partisan. This ruling will affect
everyone running for
any political office going forward, regardless their political positions and affiliations, if someone decides to cite the 14th against them.
To properly understand Section 3 of the 14th Amendment you first need to understand the historical context it was written under: The Civil War.
Section 3's purpose is to bar present and former enemies of the United States who broke their oath to protect and uphold the Constitution from holding any political office. In other words, its purpose is to bar former Confederate politicians and soldiers who broke away from and acted against the Union from holding political office.
Congress subsequently pardoned all former Confederates, and Section 5 also makes it clear it is Congress who enforces the 14th Amendment via legislations. I actually wasn't entirely aware of Section 5 until I re-re-read the whole Amendment again as I was writing this comment (thanks for giving me a reason!), so SCOTUS's reasoning becomes even simpler.
TL;DR, SCOTUS from what I can tell clarified two things:
1. Federal matters such as Federal political offices are the sole jurisdiction of the Federal government, not State governments.
2. Congress's sole authority to enforce the 14th as they and only they see fit.