I maintain that for most politicians, the choice of a party is not about ideology--it's about which party, given their locale and connections, is the best career choice. For most (not all), the ideology comes later.
Here we have a man who is clearly not a libertarian using the Libertarian Party as his vehicle.
It's a two-way street, though.
His supporters see Johnson/Weld as a way to "grow the party."
They're only too happy to be used by Gary and Bill because they're also using them.
Channeling Bob Barr.