Bikini Bottom doesn't have an elected president. Neptune rules those seas.
If Trump were running in Bikini Bottom - he would win there too.
Mr Crabs? Definitely republican. Would hold a voting booth at the Kristy Krab - promoting Trump.
Sandy? The first Squirrel on the sea floor -is definitely a conservative. It was Republicans who landed on the moon first - ergo a Republican squirrel obviously.
Squidward? Definitely