Political party

In politics, a political party was a group with the same ideology.

United Kingdom
In the 17th and 18th century, Parliament was made up of the Tories and the Whigs. (PROSE: Newtons Sleep) The Tories were followers of the King while the Whigs opposed the divine right of the King and advocated for free trade. (PROSE: The Adventuress of Henrietta Street)

The Conservative Party and the Liberal Party existed in the 1960s. (PROSE: Nothing at the End of the Lane)

The SNP (PROSE: The Dying Days) and the Greens were parties in 1997. (PROSE: Head of State)

Upon becoming Prime Minister of the United Kingdom as "Harold Saxon" with the Vote Saxon campaign, accused the members of his Cabinet of abandoning their parties when they saw the vote swinging his way. (TV: The Sound of Drums)

United States
In the United States of America, the Federalists and Republicans were parties in 1799. (PROSE: Christmas on a Rational Planet)

Abraham Lincoln was a Whig congressman prior to 1858. (PROSE: Blood and Hope)

By 2012, the opposing political parties were Republican and Democrat. (TV: Dalek)

The Libertarian and Green parties were minor Parties. They endorsed Matt Nelson, a Democratic Farm-Labor party senator who ran for President under the Radical Party. (PROSE: Head of State)

Germany
The NSDAP, better known as the Nazis, were an political party in Germany. (PROSE: Just War)

Behind the scenes

 * The three major political parties of the United Kingdom — Conservative Party, Labour Party, and Liberal Democrats — were respectively represented by the red Drone Dalek, blue Strategist Dalek and yellow Eternal Dalek across the three alternate covers of the 3-9 April 2010 edition of the Radio Times.
 * Despite the Liberal Democrats's colour being amber (a yellow-orange colour), the orange Scientist Dalek was not used.