Acting on a baseless conclusion does not a principaled stand make.
It is not baseless. She lacks credentials. She along with about 10,000 other lawyers made it to partner in a law firm. That hardly puts her at the top of her profession.
About the only other credential we are hearing about is a very low level elected position and as donut server in her evangelical (maybe?) church.
She may or may not turn out to be a good Supreme Court Justice but it not would not be unprincipled to vote against her on the basis of her lack of credentials.