Kate worked behind the scenes to foster her father's calculated efforts to wrest the 1864 Republican Party nomination for President from Lincoln, but the plot blew up in Chase's face when it became public, requiring Chase to settle back into his Treasury Secretary position. One of Chase's many perfunctory offers of resignation from the Cabinet was accepted by Lincoln (much to Chase's surprise and consternation) in 1864, but the President appointed Chase Chief Justice upon the death of Roger Taney that year. The evidence conflicts as to whether Kate welcomed this prestigious appointment or rued it as an attempt to put her father "on the shelf" so as to preempt any hope of his attaining his most-cherished ambition for the highest office in the land.