Some of it comes from the Hater-in-Chief, Mitch McConnell. But, I think, much more comes from the facts that (1) the parties are deeply divided on major issues (my post on Krugman's assessment), and (2) the extreme positions of the GOPlin politicians is out of step with the general electorate (my post on Greg Sargent's essay). And multiply that by a cupful of racism.
Here are snippets from the NY Times (citing Laurie Roberts at azcentral.com).
On April 3, Colbert King, a Washington Post columnist summarized a series of actions by Republicans attacking the president’s authority in areas that most Americans thought had been settled by the Civil War. Arizona legislators, for example, have been working on a bill that "prohibits this state or any of its political subdivisions from using any personnel or financial resources to enforce, administer or cooperate with an executive order issued by the president of the United States that has not been affirmed by a vote of Congress and signed into law as prescribed by the United States Constitution."
The bill sounds an awful lot like John C. Calhoun’s secessionist screed of 1828, the South Carolina Exposition and Protest. Laurie Roberts of The Arizona Republic wrote that it was just "one of a series of kooky measures aimed at declaring our independence from federal gun laws, from the Affordable Care Act, from the Environmental Protection Agency, from the Department of Justice, from Barack Obama."
The Senate majority leader, Mitch McConnell, who declared war on the new president in 2009 as minority leader and used the filibuster to paralyze the Senate, essentially told foreign governments to ignore the carbon-emission goals Mr. Obama was trying to set by international agreement. Because climate-change deniers in Congress and in some states oppose the effort, setting those goals is pointless, Mr. McConnell pronounced last month.
If this insurrection is driven by something other than a blend of ideological extremism and personal animosity, it is not clear what that might be. But it is ugly, it deepens mistrust of government and it harms the office of the president, not just Mr. Obama.
h/t Michele Manos