Joe Biden is actually...really, really, really poor by any kind of political reference, lol.
Obama even offered to pay for Beau's treatments for him because he knew that was something Joe would actually have to "figure out." That isn't common, at all, with any typical politician at that level. It just isn't.
Strange to think about, but you have to look at how he hasn't actually made money like a lot of them have (Obama was really only independently wealthy because his 2x memoirs, published several years before and the year-of his election, I think, were best sellers before he ever gained any real power. Post-Presidency of course puts you in "foundation" territory, which is an entirely new level of course, but usually it's marriage-into-wealth for a lot of them (Kerry, McConnel), or the usual dirty political money-shaving and money laundering (Well, Mitch again, lol))