Lincoln: Republican
Kennedy: Democrat
That’s all you need to know to understand Obongo’s decision.
He could easily attend both events should he choose to do so. They are several days apart.
If President Bush was still President, he would be going to the 50th Anniversary of JFK’s assassination. There has only been 44 People as President out of billions of Americans so this trumps everything! Probably the hardest job to get percentage wise on the planet.
Gettysburg is very close to DC. He went to a 200th Anniversary of Lincoln’s birth event, though.