By Dan Weil Morningstar has put together a roster of the 10 most undervalued stocks that have earned a wide moat from the firm. With the S&P 500 dropping 20% year to date, many stocks are now arguably undervalued. Morningstar has put together a list of the 10 most undervalued stocks that have earned a wide moat from the firm. The firm determines whether a stock is undervalued according to the fair value estimates of its analysts. A wide moat means the companies have “significant advantages that allow them to successfully fend off competitors for decades,” according to Morningstar. As for the l…