If something is prejudicial towards a particular point of view, you can call it partisan. You'll often hear of the partisan politics in the U.S.— since politicians seem to be completely devoted to the agendas of their own parties.
Partisan can be used to describe rabid supporters of any person or activity. In American English, however, it is most often used to refer to politics and the American two-party system of Democrats and Republicans. A bill introduced may have partisan support from the party that introduced the bill, or — more rarely it seems to American voters — the bill may even have bipartisan support. The prefix bi is added to show the support from both parties.
Primary Meanings of partisan
a fervent and even militant proponent of something
devoted to a cause or party
a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries
n a fervent and even militant proponent of something
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a prejudiced person who is intolerant of any opinions differing from his own
a stubborn person of arbitrary or arrogant opinions
a person with a prejudiced belief in the superiority of his or her own kind
someone who does not believe in the social or economic or political equality of men and women
a person who hates or fears homosexual people
a person with a prejudiced belief that one race is superior to others
sectarian, sectarist, sectary
a member of a sect
someone who believes the races should be kept apart
n an ardent and enthusiastic supporter of some person or activity
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addict, freak, junkie, junky, nut
someone who is so ardently devoted to something that it resembles an addiction
someone who demonstrates enthusiastic or excessive cordiality
a ballet enthusiast
a person motivated by irrational enthusiasm (as for a cause)
a person who delights in designing or building or using gadgets
a photography enthusiast
fan, rooter, sports fan
an enthusiastic devotee of sports
a fan of bull fighting
someone who spends all leisure time playing sports or working out in a gymnasium or health spa
a fan of racing who watches races from the outer rail of the track
adj devoted to a cause or party
devoted to a political party
having or marked by a strong tendency especially a controversial one