I think Hillary rightfully got dragged across the coals for her comment on Nancy Reagan / AIDS, especially since it was unprompted and so dangerously uninformed, and she should have put out more than a simple 2-line statement on it in response.
This... feels dumb and manufactured, and not on her part.
The question "where was...?" is meant to be rhetorical about whether Bernie was actively advocating for and backing up the healthcare push in 1993, and not a literal request as to Bernie's physical location, like some responders are treating it. Like, when people ask "where was President Bush during Hurricane Katrina?", they expect more than a glib response of "that day he was probably sitting in the White House haha... why do you ask?"
And the "thank you" notes seem like the customary thank you's you'd provide any legislator (of either party) who indicated they'd vote for your legislation. Her comment was probably more about him not being as strong a public advocate for healthcare legislation back then as he is now. It's fine to say that Bernie was in fact a strong advocate back in 1993 and point to his legislative record or public appearances, but "thank you" notes are hardly compelling evidence.
Sure, Clinton should have realized her words would be open to this kind of interpretation and response, and it wasn't a very savvy line to use, but people trying to treat it as some kinda "gotcha!" moment that shows how forgetful or dishonest she is seem a bit disingenuous to me. Respond to the substance of her criticism (about whether Bernie had an active role in healthcare reform in the 90's) rather than this childish crap ("Hillary, are you blind, he's standing right there!")