What makes you think it will be or should be a minority? Let'em filibuster a minority, hell, I'd love to see them filibuster a female nominee. It'll just show the American people this talk about "minority rights" and "womens rights" the left loves to trot out is just a bunch of hooey-balooey.
The left couldn't go after Alito's stellar career on the bench, so they were left with attacking his character and dragging his wife into the whole sordid mess.
Political calculation.