Tomorrow, the 1972 Miami Dolphins will visit the White House. Well, not all of them. At least three of the former players are refusing the attend the ceremony because they can't stand President Obama or his administration (for whatever reasons) (see here).
Now, it's true that presidents use these photo ops with successful sports teams for politically self-interested purposes - they always have, they always will. And no one wants to provide political support to an administration of a person or party they don't like. But in the past respect for the office of the president was usually enough to ensure that invited guests - even those with diametrically opposed political positions - would attend.
Apparently, that's no longer the case. It's all about whether you like or hate the person and the positions for which he or she stands. I feel sorry for those whose political views have become so personalized and consume so much of their lives (or who feel so self-important) that they can no longer tolerate spending a short period of time in the company of the chief executive of the United States - the only person subject to the votes of all American citizens.