IMHO, nothing will come out of this challenge to Tim Kaine's selection as VP except for a lot of political hand-wringing.

Sanders delegates exploring challenge of Kaine selection
Adam Behsudi | Politico
July 25, 2016
http://politi.co/2aorf4u

[snip]

Tim Kaine's selection riled many Bernie Sanders supporters. | Getty

PHILADELPHIA — Supporters of Sen. Bernie Sanders are moving toward a challenge of Sen. Tim Kaine’s selection as presumptive vice presidential nominee, accusing Hillary Clinton of failing to roll back “some of the worst neo-liberal policies” with her choice of running mate.

“There’s serious interest right now and exploration as we speak of a formal challenge,” Norman Solomon, a California delegate and national coordinator for the Bernie Delegates Network, said at a news conference Monday. The network represents about 1,250 of the 1,900 delegates that have pledged support for Sanders.

Kaine’s selection riled Sanders supporters, who accuse the Virginia Democrat of being too closely tied to Wall Street and fault him for his past strong support for trade deals.