David Cameron

Merkel is last of Obama's key European allies still standing

Just a few months ago, German Chancellor Angela Merkel brought together the leaders of the U.S., Britain, France and Italy to discuss the world's crises, a moment captured in a photo of the five seated around a conference table. When she hosts a summit of 20 leading global powers in July, she will be the only one of them left — and many of the policies her partners worked for might be reversed.

Merkel, the last of President Barack Obama's key European allies still standing, appears well on course to extend her 11-year grip on power, though even she warned her conservative party Tuesday that she faces her most difficult campaign yet.

Many people "feel that the...