E.J. Dionne: Will impeachment make Democrats an organized party?

(Andrew Harnik | AP file photo) Democratic Caucus Vice Chair Katherine Clark, D-Mass., accompanied by Democratic Caucus Chairman Rep. Hakeem Jeffries of N.Y., left, speaks at a news conference following a House Democratic Caucus meeting on Capitol Hill in Washington, Wednesday, Jan. 23, 2019. Cambridge, Mass. • If you like your politics orderly and by the numbers, and if you can’t stand having to come to terms with people of very different views and backgrounds, here’s a piece of advice: Don’t bother being a Democrat.

Normally, Democrats wear their diversity as a badge of honor, even as they feud and scuffle. But with House Democrats in the heat of an impeachment inquiry into President…