The differences between you may be important. But way less important than that whichever of you gets the nomination wins in November.
Two extraordinary aspects of our national circumstance oblige you to allow that priority to dictate how you conduct your campaigns.
Let's start with who controls the Supreme Court for the next generation.
Whatever your differences, on the crucial question of the direction of the Court for years to come, you are essentially the same.
That should be reason enough for you to refrain from undercutting each other and sowing division in Democratic ranks.
Any party having such power, unrestrained by the usual "checks and balances," might be cause for concern. But the idea of such power in the hands of this Republican Party is downright scary.
This is a Party that has blocked measures to deal with every challenge this nation faces--whether climate change, income inequality, or the epidemic of gun deaths. ("If [Obama] was for it, we had to be against it," reported former Republican Senator from Ohio, George Voinovich.) And now the GOP has taken obstructionism to a new level with its unprecedented refusal to consider any nominee, submitted by this duly-elected president, to fill a vacancy on the Supreme Court.
At the state level, the GOP has allowed education systems to be damaged (Louisiana, Kansas) in order to save money that can be used as tax breaks for the rich, and children to be poisoned (Michigan) as a result of measures contemptuous of democracy.
Meanwhile, Donald Trump has become the front-runner in the Republican presidential race by expressing in more blatant form the bigotry and belligerence and indifference to truth that have increasingly characterized that party.
The battle we need for you to lead is not just against the eventual Republican nominee but against that party as a whole.
It's time you changed your way of competing against each other into a form that shows you understand what America needs.
Compete with each other over who can best lead this battle, who can best awaken the American people to the threat to our future as a nation this "outlier" Republican Party has become.