On Friday, the Huffington Post‘s Dan Froomkin posted an article on how the media whiffed on “the single biggest story of the 2012 campaign:”

But according to longtime political observers Thomas Mann and Norman Ornstein, campaign coverage in 2012 was a particularly calamitous failure, almost entirely missing the single biggest story of the race: Namely, the radical right-wing, off-the-rails lurch of the Republican Party, both in terms of its agenda and its relationship to the truth.

Mann and Ornstein are two longtime centrist Washington fixtures who earlier this year dramatically rejected the strictures of false equivalency that bind so much of the capital’s media elite and publicly concluded that GOP leaders have become “ideologically extreme; scornful of compromise; unmoved by conventional understanding of facts, evidence and science; and dismissive of the legitimacy of its political opposition.”

The 2012 campaign further proved their point, they both said in recent interviews. It also exposed how fabulists and liars can exploit the elite media’s fear of being seen as taking sides.

“The mainstream press really has such a difficult time trying to cope with asymmetry between the two parties’ agendas and connections to facts and truth,” said Mann, who has spent nearly three decades as a congressional scholar at the centrist Brookings Institution.

“I saw some journalists struggling to avoid the trap of balance and I knew they were struggling with it — and with their editors,” said Mann. “But in general, I think overall it was a pretty disappointing performance.”

“I can’t recall a campaign where I’ve seen more lying going on — and it wasn’t symmetric,” said Ornstein, a scholar at the conservative American Enterprise Institute who’s been tracking Congress with Mann since 1978. Democrats were hardly innocent, he said, “but it seemed pretty clear to me that the Republican campaign was just far more over the top.”

Lies from Republicans generally and standardbearer Mitt Romney in particular weren’t limited to the occasional TV ads, either; the party’s most central campaign principles — that federal spending doesn’t create jobs, that reducing taxes on the rich could create jobs and lower the deficit — willfully disregarded the truth.

“It’s the great unreported big story of American politics,” Ornstein said.

After banging around on the blogosphere over the weekend, Froomkin’s piece received renewed attention today, when the New York Times‘ public editor, Margaret Sullivan (most recently seen taking her own employer to task — twice — for its lack of coverage of the Bradley Manning trial), highlighted it:

I find Mr. Ornstein and Mr. Mann’s observations smart, provocative and on target in many, though not all, places.

I disagree, for example, that the move toward fact-checking has made the press’s performance worse. On that subject, I agree with The Times’s political editor, Richard Stevenson, who told me last September in a column I wrote on this subject that he saw the move toward “truth-squading” as “one of the most positive trends in journalism that I can remember.” But to take it one step further, I believe that fact-checking should be more integrated into every story and not treated as a separate entity off to the side.

And I think the two commentators fail to see the progress that The Times and other newspapers are making – away from false equivalence and toward stating established truths and challenging falsehoods whenever possible.

That progress, granted, isn’t happening fast enough or – more important — sweepingly enough. And their point of view ought to provoke some journalistic soul-searching.