There are a lot of unpleasant numbers for Republicans in the Congressional Budget Office’s assessment of their health care bill. But congressional leadership found one to cheer: The report says that the bill will eventually cut the average insurance premiums for people who buy their own insurance by 10 percent. House Speaker Paul Ryan pressed that point in a series of appearances Monday night, suggesting that the budget office had found that the House bill would increase choice and competition and lead to lower prices. The Senate majority leader, Mitch McConnell, issued a statement saying, “The Congressional Budget Office agrees...