quality:corruption
Influence

Advocacy groups can also exert influence on political parties. The main way groups do this is through campaign finance. For instance; in the UK, the conservative parties campaigns are often funded by large corporations, as many of the conservative parties campaigns reflect the interests of businesses. For example, George W. Bush 's re-election campaign in 2004 was the most expensive in American history and was financed mainly by large corporations and industrial interests that the Bush administration represented in government. Conversely, left-wing parties are often funded by organised labour – when the British Labour Party was formed, it was largely funded by trade unions. Often, political parties are actually formed as a result of group pressure, for example, the Labour Party in the UK was formed out of the new trade union movement which lobbied for the rights of workers.