Josh Marshall, "Did Dave Brat Fib About Princeton?", TPM 6/11/2014:
The Post suggests that Brat was trying to give would-be supporters the sense he locked horns with the elites on an Ivy League campus. And if that was the plan or the impression. That's really not right. But picture, I don't think there's much to see here. As a gotcha, it's an extremely weak one.
This is apparently a short form of the adverbial adjunct "big picture", which is sometimes used to mean something like "all in all" or "bottom line", as in these web examples:
It may sting, but big picture, I'm ok…
Oh, but big picture, I am majoring in biology.
Ergo, picking bottoms is a fools errand, but big picture – I think we're significantly closer to the bottom than the top.
But big picture, I was real pleased with the way Drew played.
So big picture, I know we've got to really step it up in these last nine games if we want to reach our goals and our potential.
So, big picture? I'm having a pretty amazing year.
So big picture it is ahead of where most thought it would be.
It's a good win, and big picture it's great.
And big picture, it sets a bad precedent for future licensing deals.
Christian compromises on something like this because, big picture, he loves this man, wants him to be happy and recognizes that this is something important to to him.
So maybe Josh just left out the "big" by mistake . The unwanted sentence-boundary punctuation in "And if that was the plan or the impression. That's really not right." suggests that the passage was not very carefully proofread. But we could be witnessing the birth of an idiom.