The pure magic of Walt Kelly’s “Pogo” comic strip defies easy description. It appeared in newspapers around the country and galvanized thought among the thoughtful. His strange and beautiful comic strip was, in its day, “Doonesbury,” “The Simpsons,” and “The Jon Stewart Show” all rolled into one, times ten. Its satirical bite was so effective that newspapers would opt for either the innocent joke version or go for the political version of the comic strip. Has Walt Kelly been relegated to the margins? That is where many an odd genius will dwell only to be rediscovered. Thanks to Fantagraphics Books, the Pogo comic strips are getting their due.