The comments here very well capture how Biden's campaign looks from the outside. Cool.
I read the f-book picture above and interpreted it to mean that he would make the announcement of his VP at midnight (tonight). So I went and googled that, and there is no media outlet giving any sort of timeline as to when he'll make his pick, much less at midnight tonight. Then, I came back here, re-read the last sentence, and now I'm interpreting this midnight registration deadline to mean... absolutely nothing. "Please register by midnight, we desperately need money, get on our mailing list, stat!" is the best I can think of.