Keesing's World News Archives is the web version of Keesing's Contemporary Archives (1931-1987) and Keesing's Record of World Events (1987 to present).
Political scientists often rely on Keesing's Contemporary Archives and Keesing's Record of World Events when they create a dataset on political institutions and political events. For example, Przeworski et al. (2000) use Keesing's Record of World Events to count the number of presidential and legislative elections in a given year (see pages 295 and 297).
When you use Keesing's, do record the page numbers your coding relies on. This allows other researchers to replicate your coding, which has been more often than not ignored so far. See page 19 of Munck and Verkuilen (2002) "Conceptualizing and Measuring Democracy: Evaluating Alternative Indices," Comparative Political Studies, Vol. 35, No. 1, pp. 5-34.