...As Vice President Kamala Harris grapples with a portfolio of seemingly intractable issues and responsibilities that have drawn her away from the national spotlight — she Zoomed into the infrastructure Cabinet meeting from Paris on Friday — other Democrats have raised their own national profiles.... ...Though the expectation remains that Biden will mount a reelection bid, Democratic operatives are preparing for the possibility that it won’t materialize... Biden has also said he wants to be a bridge to the next generation, which has fed routine speculation that he could bow out to make way for a younger Democratic candidate. Typically,...