Via MediaBistro’s TV Spy:
The Highest Form of Flattery? WNCT Airs Nearly Identical Promo as WCVB
Handy side-by-side video comparison:
Weird, eh? TV Spy explanation:
In February, WCVB’s Sean Kellytraveled to Kabul and reported on the work of a Massachusetts National Guard unit. Now, WNCT’s Chris Brown is in Afghanistan on a similar assignment.
[snip]
It turns out that Brown, as part of his preparation for making the trip, reached out to Kelly for advice. It was an informal sharing of ideas as Kelly gave Brown suggestions about equipment and travel. As part of their conversations, Kelly shared some WCVB materials with Brown.
“There was a misunderstanding about what material of our’s [sic] that they could use,” said the WCVB spokesperson.
That’s very gracious of ABC-affiliate WCVB, since WNCT is a CBS affiliate.
Then again, presidential primary season is upon us, and who knows if the Tar Heel State will be pivotal?
Can’t hurt to hedge your bets.
Campaign Outsider 
Actually it doesn’t matter the particular network with which any television station is affiliated; it matters more whether the OWNERS have TV stations in the same markets competing for the same viewers. I write “same viewers” because Hearst-Argyle and Media General have outlets in the Tampa-St. Pete market but Media General’s station is not affiliated with what used to be called a “major network” and therefore may not have a local news presence (I’m just guessing). Media General just acquired WJAR-TV in Providence as part of the Comcast/NBCU deal, so they could now be at each other’s throats!