"partisan bias" is a correct and usable phrase in written English.
It can be used to refer to a preference for or against one particular political party or set of beliefs, usually by someone in a position of power. For example, "The judge's decision was clearly influenced by partisan bias."
Support for charity has a partisan bias.
Like most perceptions of candidates, perceptions of their traits are rife with partisan bias.
He encouraged the new king's partisan bias, turning it unremittingly to his advantage.
It was not just the main opposition that saw partisan bias at the tribunal.
The Congressional Budget Office's consistent forecasting errors arose not from any partisan bias, but from its methods of projection.
Data suggest that polling in presidential elections has no history of partisan bias, at least not on a consistent basis.
Such a spectacle would inevitably be portrayed as partisan, biased, and part of the post-colonial west's alleged wider vendetta against black Africa.
Congressional committees can help expose and remedy bureaucratic paralysis and partisan biases, but in this case these committees are the source of the problem, with both political parties contributing equally to the mess.
At a news conference Wednesday, Mr. Ritchie responded to the accusations, telling reporters that when he took the oath of office, he shed partisan biases and became "a servant of the people of Minnesota".
Nevertheless, we also find, as expected, that levels of ignorance (i.e., the numbers of voters who simply "don't know" whether or not their MP overclaimed) were considerable and that partisan biases played an important role in influencing perceptions.
Specifically, voters may either not know about their representative's behaviour (Delli Carpini and Keeter 1996; Holmberg, 2009) or develop incorrect perceptions based on personal or partisan biases (Campbell et al., 1960; Fenno, 1978; Peters and Welch, 1980; Ferejohn, 1990).
