Here's the thing - what if Johnson loses the nomination?
I don't think Libertarian grassroots would take the news of Weld being on the ticket too well.
I'm not sure how predictive it has been in the past, but a recently-created "who do you want to be the nominee?" poll on the LP's website has Peterson ahead of Johnson 50%-31% with McAfee at 10%.
Ah. Internet polls. I'm really not sure why more people don't take them seriously in the Paul administration. At least we'll have Bernie for our next president.