Trouble is, those senators don't consider it a mistake when they voted for RBG. They voted for her because they believed that the POTUS earns the right to pick whomever he wants and absent obvious illegalities or proven history of mental instability or some other glaringly obvious disqualifier (please note that ANY of the "deficiencies" discussed on any Miers thread don't even approach this high bar).
At the end of the day, she'll be approved at least 65/35. You heard it here first.