A slowdown in price gains delivered a second dose of welcome news for President Biden, who has spent months on the defensive about rapid inflation and his handling of the economy. The moderation comes just two days after his party defied the kind of political blood bath that many had expected given voter concerns about the economy, including price gains that hit a 40-year high this summer. Mr. Biden took quick credit for the slowdown in the Consumer Price Index on Thursday, saying in a statement that his policies are helping to cool price gains while acknowledging there could be...