Found this in Nisbet's Twilight of Authority. It's from Tocqueville, The Revolution:
"The parties themselves, decimated, apathetic, and weary, longed to rest for a time during a dictatorship of any kind, provided only that it was exercised by an outsider and that it weighed upon their rivals as much as on themselves. This feature completes the picture. When great political parties begin to cool in their attachments without softening their hatreds, and at last reach the point of wishing less to succeed than to prevent the success of their opponents, one should prepare for servitude--the master is near."