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The Christian Social Union of Bavaria () is a Christian democratic political party in Germany. It operates exclusively in the state of Bavaria, while its sister party, the CDU, operates in the rest of the country. On the federal level, the CSU is often perceived as the more socially conservative of the two parties. At times, especially when the CDU showed weaknesses, there has been considerable tension up to threats to break up the cooperation. Most of the time, however, they work together very closely.