The United States has the fastest-growing economy in the world. I ask you to read that again, and say it quietly to yourself. How does that make you feel? Proud, I hope, because it should. Now I’d like you to say that out loud … Once you have it down, I want you to add this: Democrats mend economies that Republicans shatter. Now I want you to say these two things together and to anybody who matters in your life for the next five months, because it would be about damn time they heard a truth that even many Democrats are curiously hesitant to shout out loud. The United States has the fastest-g…