politician

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One who is actively involved or skilled in politics, especially one who holds a political office.
• noun One who deceives or outmaneuvers others for personal gain.

from The Century Dictionary.

• noun One who is versed in the science of government and the art of governing; one who is skilled in politics.
• noun One who occupies himself with polities; one who devotes himself to public affairs or to the promotion of the interests of a political party; one who is practically interested in politics; in a bad sense, one who concerns himself with public affairs not from patriotism or public spirit, but for his own profit or that of his friends, or of a clique or party.
• noun A politic or crafty person; a petty and generally an unscrupulous schemer; a trickster.
• Politic; using artifice.
• Of or pertaining to politicians or their methods.

from the GNU version of the Collaborative International Dictionary of English.

• noun One versed or experienced in the science of government; one devoted to politics; a statesman.
• noun One primarily devoted to his own advancement in public office, or to the success of a political party; -- used in a depreciatory sense; one addicted or attached to politics as managed by parties (see Politics, 2); a schemer; an intriguer.
• adjective Cunning; using artifice; politic; artful.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One engaged in politics, especially an elected or appointed government official.
• noun Specifically, one who regards elected political office as a career.
• noun A politically active or interested person.
• noun A sly or ingratiating person.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a schemer who tries to gain advantage in an organization in sly or underhanded ways
• noun a person active in party politics
• noun a leader engaged in civil administration