No Democrat running for president has had a better 2019 than Kamala Harris. The numbers tell the tale. The California senator was in the low single digits in polls conducted before her official launch on January 28. She is now in the low double digits, running third behind Joe Biden, who enjoys cosmic name recognition, and Bernie Sanders, whose devoted supporters brought him a second-place finish last time. But polls do not tell the whole story. Harris raised $1.5 million in the day after declaring her candidacy. That number, impressive for a senator not even a third of the way...