BERLIN (AP) — Chancellor Angela Merkel appears all but certain to win a fourth term when Germans vote Sunday after a humdrum campaign produced few divisive issues but saw smaller parties gain support — including the nationalist, anti-migration Alternative for Germany, which is set to become the most right-wing party in parliament for 60 years. Merkel, already chancellor for 12 years, has run a low-key campaign emphasizing the country's sinking unemployment, strong economic growth, balanced budget and overall stability in a volatile world. Pre-election polls give her conservative Union bloc a lead of 13 to 17 points over the center-left Social Democrats of her challenger, Martin Schulz.