[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/04/art.obamaaipac.ap.jpg caption="Obama delivered a speech at AIPAC Wednesday."]WASHINGTON (CNN) - Sen. Barack Obama directly addressed accusations that have been circulating by e-mail when he addressed a pro-Israel conference Wednesday.
"I want to say that I know some provocative e-mails have been circulating throughout Jewish communities across the country," the presumptive Democratic presidential nominee said at AIPAC's annual conference.
"They're filled with tall tales and dire warnings about a certain candidate for president. And all I want to say is - let me know if you see this guy named Barack Obama, because he sounds pretty scary."
Rumors have been circulating at least since last year that Obama is a Muslim and does not support the Jewish state. He is a Christian and said at the conference he is a "true friend of Israel," earning applause.
He opened his speech by paying tribute to his rival, Sen. Hillary Clinton, calling her an extraordinary public servant who had made history alongside him in their 16-month race for the party's presidential nomination.
Obama clinched the nomination Tuesday night, but Clinton did not admit defeat in her speech after the polls closed.
Some Clinton supporters have begun to campaign for her to get the vice-presidential slot on Obama's ticket. Both campaigns deny that discussions on the subject have begun.
In his AIPAC speech, Obama also clarified a story he told last month that prompted a barrage of criticism from Republicans.
"My great uncle had been a part of the 89th Infantry Division - the first Americans to reach a Nazi concentration camp. They liberated Ohrdruf, part of Buchenwald, on an April day in 1945," Obama said.
Last month, he said an uncle had helped liberate the Auschwitz concentration camp, which was in fact liberated by the Soviet army.