Spies marry the enemy to try to gain the appearance of legitimacy. Some people even stoop to marriage solely for personal gain, don't you know?
This is probably one reason Ron Paul wants to keep working with Jesse Benton; Ron Paul probably feels he should do his best to educate him, because he's family now.
When Jesse Benton setup Bob Barr, Barr fired him. http://www.youtube.com/watch?v=cjKR9Bfaur4
When Jesse Benton setup Ron Paul, probably the only reason Ron Paul didn't fire him is because he had married his granddaughter.
Ron Paul's Convention Speech