Four days after Donald Trump’s surprising White House victory, the liberal organization CREDO Action fired off a frantic warning to its 4.6 million anxious supporters. Their worry wasn’t the new president. It was his opposition. “Democratic leaders have been welcoming Trump,” the email said. “That’s not acceptable. Democratic leaders need to stand up and fight. Now.” […] “We’re not interested in unity,” said Cenk Uygur, the founder of Justice Democrats, a new organization that’s pledged to replace “every establishment politician” in Congress. “We can’t beat the Republicans unless we have good, honest, uncorrupted candidates.” …