In re: Political Opportunism Vs. Political Pragmatism 

Political Opportunism is shifting loyalty depending solely on who is in power.

Political Pragmatism is in being pro establishment irrespective of who is in power. A pragmatic person can vote for whoever he wants. He can raise his voice if the government of the day does SOMETHING which annoys him. However most of the time he remains transactional.

I know a CHxxxA lawyer who used to hammer the Congress led UPA on social media during Hazare's nonsense. He started hammering the BJP a few years after 2014.

He was trying to play 3D chess. Since he did not have contacts in the UPA, he could not gain under that government.

Post 2014, when the few BJP contacts he had did not work for him, he once again became anti establishment to try and garner benefits from people opposed to the BJP. 

PS: That didn't work either.