Nine of David Frum's ten nearest neighbors by audience shape are fellow Journalists, with the tenth — Preet Bharara (0.99) — classified as a Professional. The scores span a tight range from 0.9951 down to 0.9878, with no single neighbor pulling meaningfully ahead of the rest.

The top of the set is anchored by Robert Costa (1.00 rounded to 0.9951), Peter Baker (0.99), John Harwood (0.99), Katy Tur (0.99), and Philip Rucker (0.99) — all Journalists. Ashley Parker (0.99), Susan Hennessey (0.99), Michael S. Schmidt (0.99), and David Fahrenthold (0.99) round out the journalist cluster. The near-total uniformity of subcategory across the top 10 is the defining structural feature: this is an audience shaped almost entirely by political journalism, with Bharara as the sole exception at the same high similarity tier.

The flat shape and compressed score range together indicate an audience with a very consistent composition — one that tracks closely with the political journalism beat and does not fragment toward other kinds of figures.