The US Democratic Party would love to offer some slot to Preet Bharara, but they have nothing to offer him - NYC mayor position is occupied by DeBlasio, and there's not enough time for Bharara to gain residency there to run. Governor's position is occupied by Cuomo, and the Congressional slots are occupied by Schumer and Gillebrand. These are all Democrats. Since Bharara is born in India, he can't be used to run for the US Presidency, although likely wouldn't be popular enough to succeed there anyway. (Perhaps billionaire Bloomberg may try in 2020, since he floated his name in 2016)
After the famously tough US General MacArthur was fired by President Truman, he said that "old soldiers never die, they just fade away" - perhaps Bharara will simply have to fade away. Like many sepoys, he'll likely just end up as a fat pensioner.