Several high profile policymakers and politicians, including Barack Obama, the presumptive Democratic nominee for the US presidential election, will address the America Israel Public Affairs Committee (Aipac) conference this week.

But Aipac is not the only organisation competing for the hearts and minds of Jewish Americans.

A new group known as J Street has launched an ambitious effort to make alternative views on the Middle East heard in the US capital.

Tom Ackerman reports.