You do know that "they" do not pick the candidates right? It is called a primary election and it is where anyone registered in the party can go and vote for WHO they want to be the candidate. It is the part of the election that is voted on by the tiniest little minority of both parties but has the absolute biggest impact on the race.
You don't like the shit ass candidate for your party? If you did not vote in the primaries then you have no right to complain. Go vote in the primaries and complain away. Otherwise suck it up and suffer, just like all the non voters who are hating Trump at the moment. Got no one to blame but yourselves.