[contentcards url=”https://www.msn.com/en-us/news/politics/trust-is-a-hard-thing-manchin-blows-up-dem-momentum/ar-AAQccfN?ocid=msedgntp” target=”_blank”] By Burgess Everett, Sarah Ferris and Marianne LeVine Joe Manchin’s pointed refusal Monday to endorse President Joe Biden’s $1.75 trillion social…