Germans vote in three regional elections seen as a test of support for Chancellor Angela Merkel’s policy towards refugees.
The anti-immigration Alternative for Germany party (AfD) is expected to make gains amid unease over Mrs Merkel’s so-called “open door” policy.
More than a million migrants and refugees entered Germany in 2015.
Asked on Saturday how she was preparing for Sunday’s elections, Mrs Merkel said: “I’m crossing my fingers.”
Polls suggest that her Christian Democratic Union (CDU) will remain the biggest party in Saxony-Anhalt in the east of the country.