I am unaware of anyone saying that Obama should have complete authority to appoint a nominee, so this seems like a very uncontroversial statement. Why did you quote it? How does it relate to your opinion?
A lot of people are calling for the senate to vote for / against a nominee strictly based on their qualifications, when obummer himself made it clear he does not support that approach. Presumably he wanted to also include the makeup of the court in the equation, something he now wants the senate to ignore.