As the Watergate scandal reached its crescendo, did Nixon remain popular with the GOP base? Or did he gradually become unpopular on both sides of the aisle?

This question has come up a few times recently, and others have provided some answers that might help you answer your own question:

u/TheAlaskan answered Did Richard Nixon have apologists in the press throughout the Watergate scandal? If so, did those journalist lose credibility after Nixon resigned? and briefly touched on the matter of popular support during the Watergate investigations.
u/TheHuscarl provided an extensive overview of the complications that arose in establishing a Nixon presidential library, the role his supporters played in it and the way its initial functioning outside of the Federal oversight on the presidential library system shaped its representation of Nixon.
u/Hal9000000, u/YourFairyGodmother and u/sleepyfloyd provided some interesting insights in a discussion on the role the Washington Post's investigations into Watergate played in bringing about the downfall of Richard Nixon.