Reminder that Democrats have never denied a Republican POTUS the opportunity to nominate a SCOTUS justice, while Republicans are poised to have done that to Democrats twice.
(No, turning down Bork's nomination is not equivalent. Reagan nominated Kennedy after that and the Senate confirmed him. That's why it's called "advise and consent." You don't automatically get your first choice, particularly one with as many ethical issues as Bork had.)
Maybe they didn't block but they certainly would before the GOP did it in 2016
https://www.politico.com/story/2007/07/schumer-to-fight-new-bush-high-court-picks-005146New York Sen. Charles E. Schumer, a powerful member of the Democratic leadership, said Friday the Senate should not confirm another U.S. Supreme Court nominee under President Bush “except in extraordinary circumstances.”
“We should reverse the presumption of confirmation,” Schumer told the American Constitution Society convention in Washington. “The Supreme Court is dangerously out of balance. We cannot afford to see Justice Stevens replaced by another Roberts, or Justice Ginsburg by another Alito.”