A beautiful piece about David, in today's NYT, that gets it right. A clip:
His political illustrations in The Review were a biweekly fix for the fuming left back in the 1960s and ’70s. But plenty of angry cartoonists soothed the savage public, then slipped down the memory chute. What has made Mr. Levine endure — why, hands down, he’s the greatest modern-day caricaturist and one of the great artists of the last half-century — is his embrace of ambiguity. The power of his famous image of Lyndon B. Johnson with a map of Vietnam scarred onto his stomach, a classic of American satire, derives from the fact that while he clearly reviled the president, he also allowed him his complexity. That’s also why his art became the indelible face of a journal so fiercely devoted to the power of words.
There's also a nice slideshow of some of his work