Maybe Democrats should consider this scenario: Hillary wins, but Republicans control the Senate. You think McConnell lets Garland through knowing that he'll suffer zero electoral consequences if he doesn't? Hell no. Hillary would be a lame duck likely to inflict extreme downballot damage in the party in the midterms. With Trump, Democrats also have a chance of getting family leave through and at making significant inroads downballot, where there would've been a zero chance under President Hillary. And with President Hillary, they'd have been screwed for redistricting and thus out of the House for another decade. So, is the chance that you MIGHT get Garland really worth it? It's not like Trump has been able to do anything that significant anyway.
Yeah, Republicans were already planning on blocking any nominee from a very unpopular President Hillary Clinton.
https://www.theatlantic.com/politics/archive/2016/11/whats-the-opposite-of-court-packing/506081/