First, Don't Cut Your Own Throat.

[MineralMan]

2. It's not just presidential elections.

It's all elections. We do not win by trashing other Democrats who are running. In fact, that's a sure way to lose. Primary campaigns should be positive campaigns, within the Democratic Party. Always. The candidates, themselves, and their supporters should try to sell the merits of their plans, rather than attacking other Democrats. If an attack is needed, attack Republicans, not Democrats.

We lose elections far too often when we forget that basic rule. It's not always our favorite primary candidate who wins the primary. Every Democratic candidate should be ready and willing to support another Democratic candidate after the primaries. Their supporters should have the same willingness. The enemy is not another Democrat. It is the Republican candidate. We need to avoid defeating ourselves.