There was Bernie Sanders at a Fox News Channel town hall, not giving an inch in a forum every Democratic presidential candidate has shunned.
His reward was a cataract of good reviews, and monster ratings. Sanders had a solid hour to try to reach people not favorably inclined to his worldview, at the very least demonstrating that he's willing to show up outside his political silo.
Why hadn't any of the other Democrats done it before? Because they lacked the verve and ideological self-confidence of Sanders, as well as the independent streak to buck the Democratic Party's attempt to hold the line against Fox.