It seems a clearer case of following a similar policy (though for land, not water), since Denali was already the primary, common, and local name for the mountain in Alaska, just not across the US as a whole [2]. I am not aware of the Gulf of America or Lake America as common names; the Gulf of America was occasionally a joke, though.

It's also not clear to me that it's fair to say "the Democrats renamed some mountain," since it was partly a clear response to an Alaskan request, made by both the Republican and Democratic Senators of Alaska [3], although the officials who made the final decision were all Democrats.

[0] https://searchengineland.com/mount-mckinley-denali-google-bi... [1] https://www.doi.gov/node/17570 [2] https://www.govinfo.gov/content/pkg/CRPT-113srpt93/html/CRPT... [3] https://www.congress.gov/bill/113th-congress/senate-bill/155