I don't like Obama either but just for the record Obama isn't the only Prez to have missed Arlington on Memorial Day.
From the Crhistian Science Monitor http://www.csmonitor.com/USA/Politics/The-Vote/2010/0527/Obama-s-busy-Memorial-Day-weekend-Arlington-cemetery-loses-out
"In fact, it’s happened before, and with Republican presidents, no less.
In 1983, President Reagan attended a Williamsburg, Va., summit and sent Deputy Secretary of Defense W. Paul Thayer to lay the ceremonial wreath at Arlington National Cemetery.
In 1992, President George H.W. Bush spent Memorial Day weekend at the Bush family's famed Kennebunkport, Maine, vacation spot, where he attended a wreath-laying ceremony at a local American Legion hall (and squeezed in a round of golf). Vice President Dan Quayle went to the Arlington ceremony".