Every president, regardless of party, tends to be judged by the electorate on how the economy performs under his watch, even though this performance is not entirely under the control of our elected officials.The public sector - mostly local government, but also federal and state - employs only 16 percent of American workers and produces only 12 to 13 percent of our nation's gross domestic product, so it is the private sector that really determines how our economy performs. Events from the past and from other countries also have a huge effect, but the government's budget decisions, regulations, tax rates …