Some thoughts: Whoever ends up filling the ninth seat on the court, this is a huge story in our history. The composition of the court would go from decidedly conservative to moderate-liberal and many landmark cases that butter the GOP's bread would be in jeopardy, such as Citizens United. With so much on the line, it is easy to see why the Republicans would go to the wall to avoid an Obama appointment. Any nominee from Obama, even a moderate probably undoes a couple of decisions and makes other rulings which hurt the Republicans as presently constituted. "Unprecedented" is a word thrown around a lot between politicians, but a wait of over a year before even considering a replacement for Scalia is that. No president has ever been denied at least a hearing for a Supreme Court nominee and the Republicans in the Senate are posturing that they won't even meet with someone the duly elected president of the United States is naming for the highest court in the land. It would be bad form for a president to get a resignation from the Supreme Court and then name a replacement right in front of the election, which is exactly what Joe Biden was talking about in his speech 20+ years ago. However, this isn't the case in 2016. There is a vacancy on the court because a Justice died. It is the president's duty to name a replacement. There isn't much history at all about filling Supreme Court vacancies in an election year simply because it would only happen if someone died. If the Republicans are really serious about not even holding hearings with Obama's nominee, perhaps a recess appointment would come into play. I'm sure the GOP would work up some outrage about circumventing the system, but if they don't give the president a legitimate opportunity to fill the vacancy, their complaints would ring pretty hollow.