A political mashup brings together political information produced by political parties (their promises and actual deeds) and information on the reception of these by professional users and the general public. Such a political mashup will enable novel historical research, creates challenging opportunities for computational linguists, and offers valuable and innovative testing-grounds for information scientists. We aim to collect, standardize in digital format, and integrate these four types of political data: election manifestos and party websites, parliamentary proceedings, political news, and political user generated content found on the web. We restrict the corpus to data ranging from 1946 to the present. Integration of these data sources consists of creating connections between them along three dimensions: [temporal] happening in the same period, being about the same event; [political actors] involving the same parties and/or members of parties and/or other politically influential actors; [political issue] being about the same political issue. The ICT infrastructure created by the project aims to make large-scale comparative research (both diachronic and synchronic) on this data possible and effective. We propose a true mashup in which users do not even experience different sources. Access to the data is by semantically meaningful items, like events, political issues, persons, and parties, not only by search terms. Users can group related pieces of data along meaningful dimensions and display data in several ways. The consortium that intends to create these facilities consists of an interdisciplinary team: historians (RUG), language technologists (UvT, UvA), as well as computer scientists specialized in information retrieval and integration (UvA). Connected to the project are providers of the most important political data: DNPP for manifestos and websites of political parties; the Koninklijke Bibliotheek (KB) and the Dienst informatievoorziening der Staten Generaal (DIV) for the parliamentary data; Parlementair Documentatie Centrum (PDC) for biographical data on politicians and political parties. The duration of the project is 2 years.