Do you have a link and references to this?
Lawrence B. Wilkerson’s campaign contribution records were/are recorded by the FEC, and are openly available at www.opensecrets.org.
The FEC only records contributions to federal candidates, not state, so there might be further contributions of Wilkerson recorded at the VA campaign contribution websites. The FEC records any contributions over $250. For the 2008-2012 election cycles, Wilkerson shows for about a dozen such contributions, starting in 2007-08. Including 2 for Obama.