Sorry to burst your bubble, but there are many counties, cities, and states where Democrats can easily get over 50%, and in some cases way more.
In California alone, Democratic voter registration tops GOP registration by double digits. I'm sure that's true in some other states.
And the cities? New York City, San Francisco, Washington D.C., Chicago, and many more ... Democrats can easily win over 30%, over 50%, and likely over 70% of the vote honestly.
and you know those “registrations” are for real do you?