Interesting musing, but the concept is diametrically in opposition to the core of leftism and is therefore impossible. The left cannot abide open, unscripted dialog. As you know, even among the the sincere, true believers of the left, truth is a subjective thing, and needs to be managed so that one can discern the "truth" in the right context. This of course takes the form of talking points, obfuscation, and so on. The leftist does not take the world as he finds it. Rather he selects and connects events and facts that will support leftist social theory. Leftist social theory ultimately claims progress toward some form of earthly paradise. As objective facts fail to support progress toward this goal, the Leftist must continuously shift emphasis onto a set of new facts that support a perpetually revisionist history.
Conservatives, on the other hand, tend to believe in objective truths, rather than theory. This is exemplified by their general disposition to have faith in markets rather than in planned economies. As Russell Kirk has pointed out, "conservatives are chastened by their principle of imperfectability.... To seek for utopia is to end in disaster.... All that we reasonably can expect is a tolerably ordered, just, and free society, in which some evils, maladjustments, and suffering will continue to lurk. By proper attention and prudent reform, we may preserve and improve this tolerable order.... The ideologues who promise the perfection of man and society have converted a great part of the twentieth-century world into a terrestrial hell."
Given this distinction, since the left preaches perfectibility, in an unperfectable world, talk radio is naturally going to lead to, shall we say, a preponderance of awkward moments. The conservatives will naturally have an easier time. Or, as Francis Bacon aptly puts it; "The man who fears no truth has nothing to fear from lies."
Cordially,
Huber
John / Billybob