As President Obama prepares for the G20 summit in South Korea this week, Sarah Palin is challenging the Federal Reserve’s monetary policy, which will likely be a key issue at the talks. On Monday, in a keynote address at a trade-association convention in Phoenix, Palin will urge Fed chairman Ben Bernanke to “cease and desist” his “pump priming.” The United States, she says, “shouldn’t be playing around with inflation.” I’m deeply concerned about the Federal Reserve’s plans to buy up anywhere from $600 billion to as much as $1 trillion of government securities. The technical term for it is “quantitative...