That didn’t happen. Polls found the public roughly divided over whether the program should be extended, with opinions splitting along partisan and generational lines. And the expanded tax credit failed to win over the individual whose opinion mattered most: Senator Joe Manchin III, Democrat of West Virginia, who cited concerns over the cost and structure of the program in his decision to oppose Mr. Biden’s climate, tax and social policy bill. The bill, known as the Build Back Better Act, cannot proceed in the evenly divided Senate without Mr. Manchin’s support.To supporters of the child benefit, the failure to extend it is especially frustrating because, according to most analyses, the program itself has been a remarkable success. Researchers at Columbia University estimate that the payments kept 3.8 million children out of poverty in November, a nearly 30 percent r …
