Obama's speech to stress responsibility

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AP – President-elect Barack Obama and Vice President-elect Joe Biden lay a wreath at the Tomb of the Unknowns …

ARLINGTON, Va. – President-elect Barack Obama has laid a wreath at the Tomb of the Unknowns at Arlington National Cemetery after a short ride from Blair House.

Obama, holding his hand over his heart, was joined at the tomb by Vice President-elect Joe Biden and Gen. Richard Rowe, commander of the U.S. Army Military District of Washington.

Visitors to the hallowed burial grounds cheered Obama's limousine as it passed by under cloudy skies Sunday morning.