the definition of "Democratic" as in "Democratic nominee"

dem·o·crat·ic
ˌdeməˈkradik/
adjective
adjective: democratic; adjective: Democratic

1.
of, relating to, or supporting democracy or its principles.
"democratic reforms"
synonyms: elected, representative, popular, parliamentary; More
egalitarian, classless;
self-governing, autonomous, republican
"a young democratic government"
favoring or characterized by social equality; egalitarian.
"cycling is a democratic activity that can be enjoyed by anyone"
2.
of or relating to the Democratic Party.