Schumer says the burden of proof is on the nominee to prove they are worthy, not the other way around. How can a nominee possibly do that when Senators spend 90% of the confirmation hearing process making speeches and only allow a few sentences here and there from the nominee's mouth!
Durbin was the 3rd Senator ( along with Leathy & Schumer)that voted against Roberts before,
Durbin: By choosing Roberts, the Prsident has chosen a more controversial candidate and thus will create a more confrontative process.