populist(n = noun.person) democrat - an advocate of democratic principles;
is a kind of advocate, advocator, exponent, proponent
Derived form noun populism₁

   A member of the People's party. [Webster 1913 Suppl.]

populist, n. & adj.
--n. a member or adherent of a political party seeking support mainly from the ordinary people.
--adj. of or relating to such a political party.

Derivative:
populism n. populistic adj.

Etymology:
L populus people

populist party