With a 50-50 split in the United States Senate, there are two things Joe Biden cannot afford: Democrat defections and a filibuster. Senate rules require 60 votes for cloture to move on legislation, and recent years have turned the filibuster into an obstruction tactic by the minority party. Senator Joe Manchin, a moderate Democrat from the very red state of West Virginia, has found himself in a very powerful position. His support or opposition to key legislation could make or break Joe Biden’s agenda in Congress. So, it’s hard not to raise an eyebrow at the fact that Joe Biden...