Speculation is rising about Arizona Senator Mark Kelly potentially becoming Vice President Kamala Harris' running mate if President Biden ends his re-election campaign, with Kelly's advantages including representing a swing state and having a compelling personal story as a combat veteran and former astronaut. Despite his name circulating as a possible replacement for Biden, Kelly has consistently expressed support for Biden and Harris. Polling data suggests Kelly, along with other Democrats, outperforms Biden in battleground states, yet Kelly remains committed to the current Democratic ticket. Meanwhile, concerns about Biden's age and mental faculties persist, prompting discussions about potential replacements within the Democratic Party.