WHAT A WONDERFUL STORY. According to an article in American Heritage magazine, Winston Churchill dropped into Bernard Baruch's office one day in 1932, decided to play the market, and as prices tumbled, plunged deeper and deeper. At the end of the day, Mr. Churchill confronted Mr. Baruch in tears, saying he would have to sell everything, including his country estate, and drop out of politics. But all the time, like a guardian angel, Mr. Baruch had been selling when Mr. Churchill bought and buying when he sold. So Mr. Churchill had lost nothing. Mr. Baruch even paid the commissions. "A born losing gambler," Mr. Baruch had characterized the British statesman.