The Democratic party as a whole is as centrist as they come these days. You're right Manchin and Sinema are chameleons -- conservatives in disguise. So many corporate democrats lean to the right, it could have been anyone. A year ago these Senators were virtual nobodies, but it so happens their financial interests strongly oppose this batch of legislation. It's astonishing how the Democrats continuously sabotage themselves even with the majority they campaigned so hard to get