A Hezbollah victory would strain ties with the US and with pro-Western nations like Egypt, Jordan, and Saudi Arabia.
The American president took his case straight to the people on his trip this week, spending limited time with the leaders of Saudi Arabia, Egypt, Germany, and France.
The president visits the city that bore some of World War II’s heaviest damage, as well as the death camp.
A win for Hezbollah and its allies Sunday would tip the region’s balance of power toward Iran.
While they expect action, many warmed to words that bespoke a knowledge and appreciation of Islamic culture.
The president didn't announce any policy changes but sought to challenge his listeners' preconceptions about the Israeli-Palestinian conflict.
The president addressed extremism, the Israeli-Palestinian conflict, women's rights, and nuclear proliferation, among other topics.
Obama criticized Holocaust deniers. But Ayatollah Khamenei praised US effort at a "new image."
His speech should aim to launch a new dialogue between two estranged communities of the world, some regional experts say.