As despicable a person Gephardt is, I think you have been reading too much conspiracy crap. Its more likely that Gephardt put him on the Homeland Security committee because all of the members were coming from those that had high level security clearance, had served on intelligence committees and had seniority. As I recall Condit had been member of one of the intelligence committess for a long time. As such it would have been more politically embarrasing to the Democrats to not put him on the committee basically saying he was guilty as were they by association than it was to quietly put him on the committee and hope no one noticed.
I don't think Gephardt is involved with this either. However, I think it was strange how he put Condit on the committee. If you remember, Gephardt had made some rather negative comments about Condit in public, finally, and then all of a sudden seemed to get very quiet and then put him on this commmittee. My guess is that someone wanted Condit on the intelligence watch and whoever that is made his/her wishes known to Gephardt.