Voters in the southern German state of Bavaria go to the polls on Sunday in a regional election that could shake the fragile coalition of Chancellor Angela Merkel in Berlin. The Christian Social Union (CSU) -- a conservative sister party to Merkel's Christian Democrat Union (CDU) -- has dominated Bavarian politics for almost seven decades. Apart from a three-year period in the 1950s, the party has continuously governed the state since 1949. At this election, however, the CSU could lose votes to the anti-immigration, far-right Alternative for Deutschland (AfD) party and to the left-wing, environmentalist Greens.
