Obama announced that he was supporting Kamela. I think Joe's family (Jill et al) and the Clintons (who are no Obama fans, either), were happy to make the phone calls to get sufficient delegate commitments that the fix was in, and Obama being a realist accepted it.
I think Kamela will have a hard time getting a big name Dem as VP. If you look at the polls, they really haven't moved. She is not popular, never has been... and certainly doesn't have a record of accomplishment to run on. There was a bipartisan vote earlier this week out of the House of Representatives blaming Kamala for the border mess... better believe there are some Dems who are unhappy with her. While Dems make the election about the personal (attacking the GOP candidate... Reagan, Bush 41, W, McCain, Romney, Trump... back to at least Nixon in my lifetime), the swing voters care about policy and competence and are not ideologues. A lot of them are pissed at the intentional concealment of Joe's mental challenges, and so are many Dem voters, some of whom will stay home, others who will only vote down-ballot and not for Prez, and still others who will go for Jill Stein or RFK Jr... and a very few who will vote Trump.
Trump's gangsta response to the attempt on his life will get him a lot of young adult votes, especially with traditionally Dem voters, i.e., minorities. When 50 Cent, Mark Zuckerburg, and other pop culture icons refer to Trump as a 'bad-a$$' the cultural zeitgeist is changing. Kamala just isn't cool, and she's unpopular with a significant percentage of the African-American community. Several major Dem politicians, e.g., Whitmer and Brashear, have told party officials they're not interested in serving as VP on a Harris ticket, because losing is fatal to Dem politicians' careers. They'll let Kamala take the loss for the team to clear the way for a contested 2028 presidential primary, knowing if they can grab the Senate for two years they can really hinder Trump and likely stop his agenda... and they aren't worried they're letting Hitler into the White House, because they know that is crap. If she wins, great! If not, no big deal if they can keep the Senate. The money will continue to flow into Dem coffers... that's all that matters, and they have the next term to destroy Trump and JD Vance (the Hitler heir apparent). It's all good.
The Dem machine has its marching orders, airbrushing Kamela's dismal record off of the Internet, telling us that she wasn't the Border Czar (who wants to own that fiasco?), she's not the same person who was so unpopular with Dem primary voters that she didn't get a single delegate in the 2020 primaries (she has never earned a single delegate), etc. They are trying to make this a done deal. I don't think it's a done deal. I expect to see some pushback at the DNC convention, inside and outside the convention hall. I think the 'selected not elected' aspect is rubbing many Dem activists the wrong way, some of who are attending the convention, others who are going to be leading protests outside.
My son, who works in the Chicago Loop, has been told by his company that the office is closed during the week of the convention, and and all staff not engaged at client sites in other cities should work from home. His is not the only downtown Chicago company that has made this decision. He's getting out of town. I expect Chicago to look like a combination of the George Floyd riots in Minneapolis and the '92 Watts riots that week... we saw a preview with the anti-Israel protests in DC over Netanyahu's visit early this week.
Kamela will likely get the nomination, and then all hell is going to break loose. It's going to be a very bumpy fall.