The only way Barr could get in is if he received an electoral vote and no other qualified candidate received an electoral vote. If Obama were disqualified between now and the time the Electors vote, then the Democrat electors would vote for Hillary or Biden (most likely the party leaders would pick a replacement nominee so all their electors could vote for him/her and avoid a nasty House fight).
I would expect those electorates could not vote, and instead, the electorate of the actual remaining majority (Libertarian) would be sent to the EC conference.
Democrats are only going because their candidate was assumed to be legitimately elected by their people. They don’t go if he wasn’t.
I never thought I'd say this in a million years, but Hillary looks good in comparison.
If bambi is disqualified, his pledged electors are disqualified and the rat ticket ceases to exist in this cycle. The only electors left are those pledged to qualified candidates.