The number of people I have heard saying stuff like "It was a politically sensitive PR, of course it should have been merged" is surprising. In fact, I would strongly recommend rejecting all such politically sensitive PRs on the basis that they are deliberately controversial, and asking the submitter politely to put their changes in a PR with more significant contributions that they submit to the project.
Relevant links:
[1] Original pull request: https://github.com/joyent/libuv/pull/1015
[2] Bryan's "I am going to fire Ben, even though he isn't my employee. Fired. Did I say fired yet?" blog post: http://www.joyent.com/blog/the-power-of-a-pronoun
[3] Issac Roth's "We'll fire Ben if he doesn't learn grammar. Haha, j/k." blog post: http://strongloop.com/strongblog/collaboration-not-derision-...