is it possible for multiple ideologies of the same country to coexist? if the answer is plain and simple im sorry 

At the start of the game, no. You'd need two separate countries.

If it's anything after the user presses play, you can start a civil war and then at a later time trigger peace and in doing so give each half of the country the states you want.

However, you will have target these countries like so:

original_tag = TAG

has_government = IDEOLOGY