Sen. Joe Manchin has yanked his proposal for a $1.8 trillion compromise on President Joe Biden’s Build Back Better plan off the table, according to reports — potentially the final nail in the coffin of the Democratic Party’s signature social-spending agenda. The West Virginia Democrat’s about-face was reported Saturday by the Washington Post, citing three unnamed sources with knowledge of the matter. The report came days after Manchin told the media that he was no longer discussing Biden’s long-sought bill with the White House.