Actually quite a lot, and Douglas Hurd and Edward Young have written a wonderful reassessment of the
great politician and showman in Disraeli: Or, The Two Lives (Weidenfeld & Nicolson # 20) in which they explore the paradoxes at the centre of his character, and how his exotic personality and ability to dazzle his contemporaries overcame his lack of principles, indebtedness and
disloyalty.