Thank you for correcting my memory on that.
Taney was not the only Supreme Court justice supported the Confederate cause while still in office...
Taney became a very arrogant man who was among the first activist Justices to 'legislate' from the bench'. His Dred Scott decision blatantly ignored both the letter and spirit of the Constitution as well as completely ignoring established precedence to the point of rewriting history to fit his political preference.
Did he support it? In January 1861 Taney wrote a memorandum to be used if the matter came before the court. In it he said, "The South contends that a state has a constitutional right to secede from the Union formed with her sister states. In this, I submit the South errs. No power or right is constitutional but what can be exercised in a form or mode provided in the constitution for its exercise. Secession is therefore not constitutional, but revolutionary; and is only morally competent, like war, upon failure of justice."