I can rather see where Senator Schumer is coming from (from the OP's link):
“The nomination of Marvin Quattlebaum speaks to the overall lack of diversity in President Trump’s selections for the federal judiciary,” Schumer complained. “Quattlebaum replaces not one, but two scuttled Obama nominees who were African American.”
“As of February 14th, 83 percent of the President Trump’s confirmed nominees were male, 92 percent were white. That represents the lowest share of non-white candidates in three decades,” he continued. “It’s long past time that the judiciary starts looking a lot more like the America it represents. Having a diversity of views and experiences on the federal bench is necessary for the equal administration of justice.”
Now, on the one hand, I agree that the 'best' candidates should be put forward for judicial nominations, regardless of skin color, religion, etc.
On the other hand, if you have a President that leans heavily towards one demographic (white male), I can see where a Senator, like Schumer, should object.
Now, if President Obama had made 92 percent of his judicial nominees black Americans (male or female), we would have heard howls of protest, justly.
However, as it turns out, President Obama was considered very 'diverse' in his nominees:
https://www.nbcnews.com/storyline/pr...umbers-n709306
Of course, I realize that to some, 'diversity' in judicial appointments is considered a communist plot or such.
President Obama had twice tried to fill this seat (apparently, a black woman and black man): each time, one of the South Carolina's Senators turned in a 'blue slip', killing the nomination.
From what I have read about Mr. Quattlebaum, he is well qualified. I imagine that Mr. Schumer is voting 'no' more as a symbolic protest against Mr. Trump's demand that jurist be white males, rather than on his qualifications. It will make no difference (I bet the vote is overwhelming for this lawyer). I will note that Mr. Quattlebaum volunteered to serve in the campaigns of Senators Graham, Scott and Gowdy, which will not hurt his chances of being approved.
https://vettingroom.org/2017/10/04/a...tlebaum/#ftnt3