Why assume that senators will be loyal to their master? 

But wait a second! Who knows for sure that all 250 honourable senators will vote in unison for Prayut? While it is true they will be handpicked by the junta from a list of retired military generals and Thaksin adversaries, I have faith they will dutifully vote with their conscience. Being picked by the junta doesn’t mean they will sell their souls to it. Look at the Election Commission and the Constitutional Court. Both are stacked with junta appointees but both remain ... well, sort of, impartial.
Let’s have faith, hold our criticism and wait until the fat lady has finished singing.
Somsak Pola 
Samut Prakan