Now, why didn't I think of this:

"Rubbed the wrong way, mother invents solution", The Examiner, 11/30/06

... when her child, also a lefty, began coming home with the smudges as well, she knew that something needed to be done.

"He was all, 'Mommy, my hands are all dirty,' and, you know, I told him that's part of being left-handed. That's a problem, and he wasn't happy about this."

The better pens don't smear as easily but when I'm careless about it, it's still a problem.