Dividend growth investing is a popular and largely successful approach to generating wealth over long periods of time. We will be spotlighting numerous dividend up-and-comers to identify the best "dividend growth stocks of tomorrow." Today we look at Core-Mark Holding Company (CORE). The company operates in a difficult environment that negatively impacts its fundamentals. While top-line growth has carried the day, sales growth could be slowing due to decreasing activity from smoking customers. With cigarette sales continuing to dwindle in the US, revenue growth remains a potential problem for Core-Mark. This along with a cash