One can find this present in how media coverage of political issues is demonstrated. For example, the manner in which the recent Teabag Protests were covered could be an example of how bias might be present. Networks that devoted much in the way of coverage or syntax used such as "Freedom fighters" or "Patriots" might differ in their ideologies from another network, which either decided to not report on the events at all or in their coverage dismiss the events entirely. This could be reflective of ideology which arises from an overall support of the President as opposed to a belief that is not entirely supportive of the government. In another sphere, the same can be seen towards the attitude towards those who are investigating if the President was born in the United States or if he was not. The validation or repudiation of the "Birther" movement might be another example of how ideology can impact the news media.
In media, spin is a tool of propaganda that is used, usually deceptively but not exclusively, to convince, persuade and manipulate an audience into the belief that an event, action, person, policy etc. is something other than what it in fact is. On the other hand, media ideology is the underlying beliefs, suppositions and ideas that form the foundation of individual's, group's, society's actions, processes or institutions. It is possible for ideologies to be mistaken or mislead and, therefore, unintentionally deceptive, but spin is. by definition, deceptive and manipulative.
Media bias, i.e., tendency or inclination, can be manifest in several spheres of media representations. Bias is the antithesis of (the opposite of ) objectivity.
1 -- Decisions on selection and omission of what stories to cover and/or what facts to reveal about those stories may be made from a position of bias.
2 -- Bias can be shown through placement in the media source. For instance a political issue could be buried in the back pages of a paper or a Web site to subvert the formation of favorable public opinion.
3 -- The wording of headlines, captions and the selection of photo images can all advance a particular bias. For instance, a glamorous photo of an underdog presidential candidate could be selected by biased media supporters.
4 -- In the same vein, tone and choice of terms of address can manifest a media bias, distorting, downplaying or aggrandizing various aspects of a story or fact.
5 -- Source selection and statistics can be manipulated to present a media bias. For instance, a "leak" that either supports or diminishes the party's agenda could come from biased a political party source, and statistics can be stated in various ways to either support or detract.
[For more information see the links below, which were sources for this Answer.]