They probably looked at his portfolio and background:
From 2001 to 2008, Biden was a founding partner of Oldaker, Biden, and Belair, LLP, a Washington DC-based law firm.
[9] He also served as a partner and board member of the mergers and acquisitions firm Eudora Global. Biden was chief executive officer, and later chairman, of the hedge fund Paradigm Global Advisors, founded in 1991 by Dr. James Park. At
MBNA, a major US bank, Biden was employed as a senior vice president.
[8] Following that, Biden was appointed by
Bill Clinton to serve in the
United States Department of Commerce[8] under Secretaries
Norman Mineta and
William M. Daley. He was director of E-commerce policy issues in the Department of Commerce
So are we to be upset that he got a free plane trip?