Before my usual claque of commentators gets its nose out of joint, I will acknowledge that the type of behavior alluded to in this cartoon is practiced by both extremes of the political spectrum. It is inappropriate--and unhelpful--no matter who is doing it.
We happen to have a Democratic president and Senate right now, so the protesting of whomever is nominated to fill Justice Stevens' seat will be the province of Conservatives.
I think it was John McCain who said, "Elections mean something." It is the constitutional prerogative of the president to present a nominee in the event of a court vacancy, and it is the Senate's job to decide whether that person is qualified.
It made sense to the Founding Fathers. What wouldn't make sense to them are the ideological hoops we make the nominees run through, thanks to our poisonous political atmosphere, and the attempts to discredit them by digging through their pasts to find out if they talked back to their kindergarten teacher during recess.
One of these days, Justice Scalia, Roberts, Alito or Thomas will want to retire. Chances are he'll wait until a Republican president is in office to do so. This is as it should be.
Then, it will be the Liberals' turn to make a public display of their unreasonableness, which they will do without a doubt.