"Annie" is a right-wing cartoon come to life on Broadway; like Ronald Reagan in the White House, it's no joke -- and just might outlast us all. The play and the President share several secrets in common, not the least of which is their ability to laugh at themselves. They also believe in pulling heartstrings, fostering homespun nostalgia at every turn, and play on the emotions to a point far beyond the credibility gap. Furthermore, both are banking on the probability that there's a bit of sappiness in us all, and that Warbucks can solve the problems of the world. And, by golly, both of them succeed consistently, in grand style. Allison Smith is a wonderful Annie (she's number four), bringing a no-nonsense young-Julie-Harris depth-of-innocence quality to the role. Marcia Lewis plays the nasty Miss Hannigan a bit broad for our taste, but the balconies love it and the balconies are a lot of what "Annie" is all about. Charles Strouse and Martin Charnin's tuneful, straightforward score has held up marvelously after four years and three months -- not that there's much competition in the original musical sweepstakes. And, leapin' lizards, who can resist dogs and orphans and Christmas and a kid inventing the New Deal, anyway? Even sourpuss Harold Ickes has to stand up and sing to that.