Manchin's spotlighted (a small spotlight, but to mention his name implies that somehow its relevant).
His wife was in the association that made the recommendation. If anything, his wife had conflict of interest. Perhaps Manchin didn't keep the "little woman" in line? But, no, to infer that would be offensive.
Manchin didn't introduce or sponsor the bill. Given how instrumental he must have been in its passing, that's surprising.
Except that it passed by voice vote/unanimous consent. Doesn't even matter if he was in the room at the time.
Of course, Obama signed the bill. But the real problem is Manchin's conflict of interest. The problem is whether he actually did anything that would be compromised by the conflict of interest, except perhaps talk.
The other problem is that the "epipen law" doens't refer to that particular product. It has schools keep a supply of epinephrine on hand. And it recommends strongly auto-injectors.
EpiPen is one such auto-injector. But it's only one of a small number of brands. The problem is that Mylan had stellar PR and advertising and pushed their product. Nobody's required to buy their brand. But it's hard to find the competition because Mylan's been so successful in marketing, in training schools to use their and just their product.
Frau Manchin probably helped her daughter's company; but at the same time, if auto-injectors weren't all that great there's no problem in discontinuing their purchase and the furor is overblown. Stock vials of the drug and some sharps.