From Weber's Politics as a Vocation. Reading this, I could not help but think of Joe Lieberman:
Vanity is a very widespread quality and perhaps nobody is entirely free from it. In academic and scholarly circles, vanity is a sort of occupational disease, but precisely with the scholar, vanity--however disagreeably it may express itself--is relatively harmless...With the politician the case is quite different. He works with the striving for power as an unavoidable means. Therefore, 'power instinct,' as is usually said, belongs indeed to his normal qualities. The sin against the lofty spirit of his vocation, however, begins where this striving for power ceases to be objective and becomes purely personal self-intoxication, instead of exclusively entering the service of 'the cause.' For ultimately there are only two kinds of deadly sins in the field of politics: lack of objectivity and--often but not always identical with it--irresponsibility. Vanity, the need personally to stand in the foreground as clearly as possible, strongly tempts the politician to commit one or both of these sins. This is more truly the case as the demagogue is compelled to count upon 'effect.' He therefore is constantly in danger of becoming an actor as well as taking lightly the responsibility for the outcome of his actions and of being concerned merely with the 'impression' he makes. His lack of objectivity tempts him to strive for the glamorous semblance of power rather than for actual power. His irresponsibility, however, suggests that he enjoy power merely for power's sake without a substantive purpose. Although, or rather just because, power is the unavoidable means, and striving for power is one of the driving forces of all politics, there is no more harmful distortion of political force than the parvenu-like braggart with power, and the vain self-reflection in the feeling of power, and in general every worship of power per se. The mere 'power politician' may get strong effects, but actually his work leads nowhere and is senseless. (Among us, too, an ardently promoted cult seeks to glorify him.) In this, the critics of 'power politics' are absolutely right. From the sudden inner collapse of typical representatives of this mentality, we can see what inner weakness and impotence hides behind this boastful but entirely empty gesture. It is a product of a shoddy and superficially blase attitude towards the meaning of human conduct; and it has no relation whatsoever to the knowledge of tragedy with which all action, but especially political action, is truly interwoven.