Analysis - Obama's caution on Ukraine may loom over midterm election

WASHINGTON (Reuters) - With Russia's incursion into Ukraine reviving Cold War-style tensions, President Barack Obama is at risk of suffering a blow to his credibility at a time when he can least afford it: as he tries to convince voters to stick with his fellow Democrats in congressional elections that will help shape his legacy.

For five years, Obama has practiced a cautious approach to foreign policy crises, prizing sober diplomacy and the search for consensus over brinkmanship, in prolonged conflicts in Iraq and Afghanistan.