The nomination fight over Judge Brett Kavanaugh has injected new volatility into the midterm elections, reshaping races across the country and sharpening the already bitterly partisan tone for the final four-week stretch before Nov. 6. But in the House, the Cook Political Report and other predictors have moved more than half a dozen seats in the Democratic direction in recent days, and Republican operatives are bracing themselves for an onslaught of Democratic money that they are calling "a green wave." Gubernatorial races - in which Democrats are trying to regain territory that they've lost in recent years, particularly in the...