The things that keep me up nights

So, yesterday, for my weekend job, I wrote this headline:

NDP endorse Layton’s call for Afghan pullout

and this teaser:

CP – The NDP has officially become Canada’s first major political party to call for a withdrawal of our troops from Afghanistan.

Here’s what’s bugging me. In the headline, NDP is considered plural, so we have endorse, instead of endorses. But then in the teaser, I used NDP as singular, thus the “has.”

So this is wrong. I *know* it’s wrong. And yet, if I change either, it sounds odd to my ear. And I can’t figure out why. I know. Of all the things to fret about? This doesn’t rank that high.

*sigh*