Rep. Allen West, a Florida Republican, was recently captured on video asserting that there are “78 to 81” Democrats in Congress who are members of the Communist Party. Of course, it’s not unusual for some renegade lawmaker from either side of the aisle to say something outrageous. What made West’s comment — right out of the McCarthyite playbook of the 1950s — so striking was the almost complete lack of condemnation from Republican congressional leaders or other major party figures, including the remaining presidential candidates.

It’s not that the GOP leadership agrees with West; it is that such extreme remarks and views are now taken for granted.

We have been studying Washington politics and Congress for more than 40 years, and never have we seen them this dysfunctional. In our past writings, we have criticized both parties when we believed it was warranted. Today, however, we have no choice but to acknowledge that the core of the problem lies with the Republican Party.

The GOP has become an insurgent outlier in American politics. It is ideologically extreme; scornful of compromise; unmoved by conventional understanding of facts, evidence and science; and dismissive of the legitimacy of its political opposition.

When one party moves this far from the mainstream, it makes it nearly impossible for the political system to deal constructively with the country’s challenges…

“Both sides do it” or “There is plenty of blame to go around” are the traditional refuges for an American news media intent on proving its lack of bias, while political scientists prefer generality and neutrality when discussing partisan polarization. Many self-styled bipartisan groups, in their search for common ground, propose solutions that move both sides to the center, a strategy that is simply untenable when one side is so far out of reach…

Democrats are hardly blameless, and they have their own extreme wing and their own predilection for hardball politics. But these tendencies do not routinely veer outside the normal bounds of robust politics. If anything, under the presidencies of Clinton and Obama, the Democrats have become more of a status-quo party. They are centrist protectors of government, reluctantly willing to revamp programs and trim retirement and health benefits to maintain its central commitments in the face of fiscal pressures.

No doubt, Democrats were not exactly warm and fuzzy toward George W. Bush during his presidency. But recall that they worked hand in glove with the Republican president on the No Child Left Behind Act, provided crucial votes in the Senate for his tax cuts, joined with Republicans for all the steps taken after the Sept. 11, 2001, attacks and supplied the key votes for the Bush administration’s financial bailout at the height of the economic crisis in 2008. The difference is striking.

If our democracy is to regain its health and vitality, the culture and ideological center of the Republican Party must change. In the short run, without a massive (and unlikely) across-the-board rejection of the GOP at the polls, that will not happen.

Thomas E. Mann is a senior fellow at the Brookings Institution, and Norman J. Ornstein is a resident scholar at the American Enterprise Institute.

This post has a bit of the beginning of the article by Mann and Ornstein – and a bit of the end. There are a few pages in between. Click the link and draw your own conclusions.