This is a significant development as both candidates are former GOP governors and as such credible.
Much has been said about third party bids this year but for the Bloombergs and other hopefuls the issue is always the very real challenge of ballot access nationwide. It's not easy, but the Libertarians have such status and across fifty states, the pair could draw a lot of votes.
I think the presence of this ticket makes the Trump running mate choice more important and will provide a safe haven for some of the "never Trump" crowd.
Can Libertarian nominees Gary Johnson and Bill Weld siphon votes from Trump? - POLITICO