Ok, you are wrong. He was NOT already an associate supreme court justice, that is the position for which he was nominated and now serves.

GOP leader Charles Grassley in the final Bush year 2008 said
"The reality is that the Senate has never stopped confirming judicial nominees during the last few months of a president's term." This of course was when there was a Democratic Senate and a GOP President, the confirmation process continued. No Democratic obstruction even though they thought it likely they would defeat McCain.

And for those who like facts rather than lies, here is the list of all the Supreme Court vacancies in the last year of an administration, facing an upcoming election since 1900.
Supreme Court vacancies in presidential election years : SCOTUSblog

The present members of the SCOTUS with all the increased scrutiny now given, averaged 71 days between nomination and confirmation. The longest time from nomination to confirmation since 1900 is the 1916 nomination of Louis Brandeis which took 125 days. Obama is the POTUS for 11 months. So either admit that the sole goal is obstruction (nothing new) or get the process going. It is not that 11 months is inadequate time to evaluate and vote. If the GOP Senators wish to vote against a nominee, that is within their right, for any reason they choose. But do your job, have the hearings, and vote.