This article looks into the limits of the invisible party. One limit that this article mentions is that some politicians look like they are succeeding during the “invisible primary” but end up failing miserably when voters arrive. The article looks at Hillary Clinton and Rudy Giuliani in 2008, and Jeb Bush and Marco Rubio in 2016. They raised large sums, generated support, and generated lots of media support during the invisible primary but never really stood a chance.
https://crsreports.congress.gov/product/pdf/LSB/LSB10515
Supreme Court held that states may punish or replace presidential electors who refuse to cast their ballots for the candidate chosen by all voters of that state. Pretty much saying that it is a law that electors need to provide all votes to keep the election fair/just. Furthermore, in Chiafalo vs. Washington, it states that Washington could impose a fine against electors who violate their pledge to support the candidate chosen in the states popular vote.