(abc) Sen. Joe Lieberman, the self-described "Independent Democrat" who caucuses with the Democratic party in the Senate even though he has endorsed Sen. John McCain, R-Ariz, got some tough talk from Sen. Barack Obama, D-Illinois, yesterday about his advocacy for the presumptive Republican presidential candidate and the general tone of the campaign, Democratic sources tell ABC News. Returning to the Senate after his securing the Democratic presidential nomination, Obama and Lieberman greeted each on the Senate floor in the Well as they were voting on the budget resolution. They shook hands. But Obama didn’t let go, leading Lieberman - cordially - by the hand across the room into a corner on the Democratic side, where Democratic sources tell ABC News he delivered some tough words for the junior senator from Connecticut, who had just minutes before hammered Obama's speech before the pro-Israel group AIPAC in a conference call arranged by the McCain campaign. The two spoke intensely for approximately five minutes, with no one able to hear their conversation. Reporters watched as Obama leaned closely in to Lieberman, whose back was literally up against the wall. Neither party is officially talking. But while Lieberman spokesman Marshall Whitman says the conversation was "a cordial and friendly discussion" and Obama campaign spokesman Bill Burton says it was "private and friendly," Democratic sources tell ABC News that the conversation was a stern rebuke to Lieberman for his criticism of the presumptive Democratic presidential nominee as had just happened on the conference call, as well as a discussion about how far Lieberman is willing to go in his advocacy of McCain, and the tone of the campaign. "It's one thing to support McCain," said one Democratic source, "but many think Uncle Joe has gone too far."

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