Walmart continues to blow expectations out of the water and is showing no signs of slowing.The Dow Jones Industrial Average contains 30 components, most of which are stable, blue chip, dividend-paying companies. While not known for blistering growth rates, even value-oriented Dow stocks can surprise to the upside.Walmart (WMT 0.16%) is up a mind-numbing 43.2% year to date -- pole-vaulting its market cap above $600 billion for the first time.Here's why Wall Street can't get enough of this dividend stock and ...