The Collaborative International Dictionary
Politicaster
Politicaster \Po*lit"i*cas`ter\, n. [Cf. It. politicastro.]
A petty politician; a pretender in politics.
--Milton.
Douglas Harper's Etymology Dictionary
politicaster
"a petty, feeble, or contemptible politician" [OED], 1640s, from Italian or Spanish politicastro, noun use of adjective meaning "political," from Latin politicus (see political).
Wiktionary
politicaster
n. A petty politician.