8. John Chambers
No. of Entries: 9
Chambers, who publicly commended the president for the President's Council on Jobs and Competitiveness initiative, has nine entries on the White House visitors log, including a CEO luncheon meeting with the president on Feb. 4, 2010. Chambers is a supporter of Republican presidential candidate Mitt Romney and was the national co-chair and economic and technology adviser to Sen. John McCain's 2008 presidential campaign.