"The repeated extradition warrants when Obama was President"
Why would there be an extradition warrant when he was holed up in the Ecuadorian embassy in London while being sought for an extradition warrant to Sweden where the UK courts would have been reluctant to send him to Sweden if there was an existing US warrant that the Swedes would act upon where the death penalty could apply?
Did you miss the whole story? The US, under Obama, were not going to make an extradition request until he was in Swedish custody. The only reason there is now an extradition hearing is because Sweden dropped their charges and the only way the US could get their hands on him is directly from the UK.
Also, and more importantly, Obama's administration tortured Bradley/Chelsea Manning with the intent of getting evidence that Assange/wikileaks actively encouraged and abetted Manning to access, export and pass on confidential information.