Closing Bell

When University of California at Santa Barbara professor Nelson Lichtenstein came onto CNBC to discuss bribery allegations against Wal-Mart De Mexico (a subsidiary of Wal-Mart), he got more than he bargained for. Kenneth Langone, an investor who helped found Home Depot, had joined Maria Bartiromo for the full hour of “Closing Bell” on Dec. 18. Langone, who is also the CEO of Geeknet and…