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BOSTON - JULY 27: Democratic Convention Keynote speaker and Illinois Senate candidate Barack Obama speaks at the League of Conservation Voters Environmental Victory Rally at Christopher Columbus Park July 27, 2004 in Boston, Massachusetts. Democratic presidential candidate U.S. Senator John Kerry (D-MA) is expected to accept his party's nomination later in the week. (Photo by Mario Tama/Getty Images)

BOSTON - JULY 27:  Democratic Convention Keynote speaker and Illinois Senate candidate Barack Obama speaks at the League of Conservation Voters Environmental Victory Rally at Christopher Columbus Park July 27, 2004 in Boston, Massachusetts. Democratic presidential candidate U.S. Senator John Kerry (D-MA) is expected to accept his party's nomination later in the week.  (Photo by Mario Tama/Getty Images)