Lwith the In hindsight, it’s easy to see Kamala Harris’s rise in the polls as inevitable. Americans have consistently told pollsters they are dissatisfied with their presidential candidates. But Ms. Harris has far and away exceeded expectationsShe has transformed her approval ratings and enthused the Democratic base. She leads Donald Trump nationally by three percentage points and has overtaken him in recent polls in most key states. Our revised presidential forecastsreleased this week, shows that on July 21, the day he withdrew, Joe Biden had a 24% chance of being reelected. Today, Ms. Harris has a 52% chance of winning in November. In effect, it’s a coin toss.