There are some lessons here. The first being, it is a problem if you actually try to fulfill your commitment to the people who elected you. Enemies will be made with the leadership. It is the right thing to do but it is tough.
Second, you will upset the apple cart even more if you expose all of this by trying to become President.
Because the threat smart members of the Washington political elite truly believe in is not Ted Cruz, but the model he represents: that the path for an ambitious freshman politician to achieve leadership of the Republican Party in this day and age is not the normal give and take and deference to leaders and precedent and the way we do things around here, but instead to take a flamethrower to this system from day one. Regardless of whether Cruz wins a general election, his nomination could fundamentally transform the political incentives of the Senate and change the internal dynamics of the Senate Republican Conference. It shows that you can get a shot at the presidency not by playing along, but by playing your own game.
The potential of every two years having someone walk through the door in each new Senate class who thinks they could be the next potential Ted Cruz is an absolute nightmare for those who have thrived in their cushy lifestyles as stewards of the world’s most exclusive club. And that is why his nomination is unacceptable.