From the Perspective of a Candidate, the Late-Night Entertainment Show

From the perspective of a candidate, the late-night entertainment show (e.g., Late Night with David Letterman) is an attractive venue because

A) the audience consists disproportionately of regular voters.
B) the late-night shows set the agenda for the next day's morning news.
C) the hosts are unlikely to ask tough, probing questions.
D) their appearances provide vivid footage for the ad campaign.