In each of the last three years, at least 40% of Americans have identified as independents. These are also the only years in Gallup’s records that the percentage of independents has reached that level.

Americans’ increasing shift to independent status has come more at the expense of the Republican Party than the Democratic Party. Republican identification peaked at 34% in 2004, the year George W. Bush won a second term in office. Since then, it has fallen nine percentage points, with most of that decline coming during Bush’s troubled second term. When he left office, Republican identification was down to 28%. It has declined or stagnated since then, improving only slightly to 29% in 2010, the year Republicans “shellacked” Democrats in the midterm elections.

Not since 1983, when Gallup was still conducting interviews face to face, has a lower percentage of Americans, 24%, identified as Republicans than is the case now. That year, President Ronald Reagan remained unpopular as the economy struggled to emerge from recession. By the following year, amid an improving economy and re-election for the increasingly popular incumbent president, Republican identification jumped to 30%, a level generally maintained until 2007.