On the "CBS News Weekend Roundup", host Allison Keyes gets the latest on the extraordinary changes in the Democratic presidential race, with Kamala Harris as the likely nominee from CBS's Nikole Killion, and incumbent President Biden's speech explaining why he suddenly dropped out from CBS's Ed O'Keefe. We'll also hear about a vaccine that may help delay dementia and an HIV vaccine. In the "Kaleidoscope with Allison Keyes" segment, a chat about the voters supporting Harris, and what Republican nominee Donald Trump is saying about her.

Featured: CBS' Jo Ling Kent on young voters.

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