The series is well worth watching, as one of the best political satires ever made. Malcolm Tucker - alias the Glasgow Goebbels, the Thin White Mugabe and Iago with a Blackberry - is the Chief of Communications for the unseen Prime Minister. His role is more akin to that of a Consigliere in the Mafia: he acts as the PMs enforcer, making sure all cabinet ministers tow the party line, as well being the party spin doctor that handles all crises stemming from ministerial incompetence. He regularly uses rumours, smears, leaks and threats of violence to achieve his end, although its obvious he believes in the ideals of his party and is a self-made man from a working class background who despises classism and cronyism.
He is manipulative, aggressive, profane, short-tempered and bullying towards politicians and civil servants, but there's a complexity to Malcolm. He treats 'civilians' - such as the cleaners, secretaries, youth activists and anyone considered his social inferior - with politeness and respect, in contrast to the politicos who are regularly condescending and dismissive of anyone outside Westminster. When he is briefly manipulated into resigning in the third season, he comforts his secreatary Samantha and even protects her from harassment from the press and the people sent to escort him from his office.
It's also interesting to know that one of his 'Tuckerisms' - "Omnishambles" - has found its way into British political lexicon and is included in the Oxford English Dictionary which describes it as "something which is completely and continuously shambolic".