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By CNN chief Washington correspondent Jake Tapper
Washington (CNN) – It was the summer of 2007 and Senator Edward M. Kennedy, D-Mass., unloaded on his junior colleague, then-Sen. Barack Obama, D-Illinois.
"You can't come in here and undo everything!" Kennedy told Obama, according to Sen. Lindsey Graham, R-SC.
Kennedy was angry, Graham would later recall, because Obama had signed on to be part of a bipartisan coalition of senators pushing a comprehensive immigration package, and yet he kept straying from the group's agreements.