US Senator Susan Collins, of Maine, said over the weekend that she would not support a US Supreme Court nominee who would reverse Roe v. Wade, the 1973 ruling that legalized abortion. That has given some people hope. It shouldn’t. The Democrats have one way to stop the Senate from confirming President Donald Trump’s second high court nominee—by denying Senate Majority Leader Mitch McConnell a quorum. That would shut down the Senate. But the maneuver requires 51 Senators. In other words, every Democrat plus two rogue Republicans.