There’s a 100% chance that Obama would nominated a crazy liberal to the USSC.
There’s less than 100% chance that any republican would do tgat.
Even 99% is better than 100%.
At least, he'd only be doing it for four years while Kennedy and the four conservatives justices remain on the court.
Eight years of Romney and/or another Democrat nominating judges and we might not see a conservative majority on SCOTUS for a generation.