Sen. Joe Manchin (D-W. Va.) started a political firestorm on Sunday after he told Fox News that he would not be supporting President Joe Biden’s Build Back Better social spending bill, effectively killing the legislation after months of delays. Social progressives were especially furious over the announcement. “What Senator Manchin did yesterday represents such an egregious breach of trust of the president,” Rep. Alexandria Ocasio-Cortez told Joe Scarborough on MSNBC’s Morning Joe. Rep. Jamaal Bowman, a newer face among House progressives, was also furious with Manchin’s decision. “Joe Manchin is the new Mitch McConnell,” Bowman said on Twitter in a jab at the Senate minority leader. “Build Back Better is Biden’s core campaign promise,” Bowman said in another tweet. “We did everything in our power to protect it and keep his/our word.” He added, “Biden is trustworthy, Manchin is absolutely not.” Manchin’s denunciation of the $1.85 trillion bill opened old …