— from BillMoyers.com

Rep. Peter King (R-NY) once claimed that “80 to 85 percent of mosques in this country are controlled by Islamic fundamentalists” and called those who worship in them “an enemy living amongst us.” He held McCarthyesque hearings into the supposed “radicalization of American Muslims,” parading a line of prominent bigots through the House Homeland Security Committee.

He’s an outspoken advocate of the war on terror – The New York Times called him “the Patriot Act’s most fervent supporter” – and has been a leading figure politicizing the attacks on our consular office and CIA station in Benghazi. King was a fierce opponent of George W. Bush’s efforts to reform the immigration system. He railed against the Occupy movement, and opposed both the 2009 stimulus package and the Lilly Ledbetter Fair Pay Act. He called for the prosecution of journalist Glenn Greenwald for reporting Edward Snowden’s NSA leaks. He has a 100 percent rating from the National Right to Life Committee and a zero percent rating from NARAL Pro-Choice America. The Drum Major Institute gave him a seven percent rating for his votes on issues of importance to the middle class last year.

In the past few weeks, dozens of political journalists have dubbed him a moderate. In fact, he’s been anointed a leader among the Republican moderates. He earned that label because, like other New York pols, he doesn’t blindly support the National Rifle Association, and because he opposes shutting down the government and threatening to unleash a potential economic catastrophe in a hopeless quest to defund Obamacare. That’s it. That’s how low the bar of moderation in the Republican Party now falls.

Arguably, the most important political story of our time – one necessary to understanding the last five years of so-called “gridlock” in Washington, DC – is one that journalists wedded to the idea that ‘both sides do it’ are uncomfortable reporting: the wildly asymmetric polarization of our two major political parties as Democrats inched to the left and Republicans lurched to the right.

This week, Dan Balz, senior correspondent for The Washington Post, took a deep dive into the roots of the latest crisis. He attributes it to “a deepening red-blue divide in America [that] has made this era of politics the most polarized in more than a century.”

The bonds that once helped produce political consensus have gradually eroded, replaced by competing camps that live in parallel universes, have sharply divergent worldviews and express more distrust of opponents than they did decades ago. Many activists describe the stakes in apocalyptic terms.

Balz covers a lot of ground, noting that red districts have become redder and blue districts bluer. He points out that there are fewer districts in which one party won the congressional vote while the other party got more votes in the last presidential election and notes that conservative Democrats or liberal Republicans no longer exist in Congress. He talks about the role gerrymandering has playedin this and the even greater impact of natural migration patterns that concentrated Democrats into tightly packed urban districts while Republicans got the advantage in suburban and rural areas.

But, he didn’t discuss the most important political trend of our time. Only toward the end of the piece, on the fifth and final page, did he offer a throwaway observation that, “Republicans have shifted more to the right than Democrats have shifted to the left,” before adding, “but on both sides passions are stronger than they were two decades ago.”

This anodyne statement glosses over the radicalization of the Republican Party since the 1980s. That shift isn’t merely a matter of opinion. Political scientists Keith Poole and Howard Rosenthal developed a statistical measure of lawmakers’ voting records that allows scholars to study the dynamics in Congress empirically. The system, known as DW-NOMINATE, ranks legislators according to how far they veer from the midline of congressional votes.

Yale political scientist Jacob Hacker used this data for his 2006 book, Off Center, in which he noted that since 1975, Senate Republicans have moved twice as far to the right as their Democratic counterparts have moved to the left. Of course, this shutdown is being driven by the Republican-controlled House, and in the lower chamber Hacker found that Republicans had shifted six times further to the right than their Democratic counterparts went to the left.

On the DW-Nominate scale, -1.000 represents the position of the most liberal vote, while +1.000 is that of the most conservative. The bigger a lawmaker’s number, the further his or her record is from Congress’s center. In the 100th Congress (1987-1989), only around four percent of Republicans had a score over 0.600, but by the last Congress almost a quarter of the Republican caucus fell into that group. The same dynamic wasn’t apparent on the Democratic side of the aisle: The share of Democrats who scored between -0.600 and -1.000 rose from slightly less than six percent of the caucus in 1989 to just over nine percent in the last Congress.

But that’s not the whole story. DW-Nominate scores don’t measure lawmakers’ liberalism or conservatism. They measure how far their votes are from other votes in the same Congress. As such, it doesn’t factor in shifts in the ideological center itself. That center has shifted dramatically to the right over the last 30 years.

In a 2012 article for The New Yorker, Ryan Lizza quoted Thomas Mann, of the Brookings Institution, and Norman Ornstein, of the conservative American Enterprise Institute, from their book, It’s Even Worse Than It Looks:

One of our two major parties, the Republicans, has become an insurgent outlier—ideologically extreme, contemptuous of the inherited social and economic policy regime, scornful of compromise, unpersuaded by conventional understanding of facts, evidence and science, and dismissive of the legitimacy of its political opposition.

There is no doubt that at the root of this crisis is a deeply polarized public. But, the key aspect of this story is that the Republican Party veered toward the extreme of its ideological orientation just as the country was becoming more diverse and tolerant – and as the most progressive generation in 70 years was coming of age – and that dissonance has driven them to cast off the legislative norms that have traditionally made our divided government work.

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