I think it’s interesting that Martinez says he never read the memo but managed to pass it to Tom Harkin. That’s possible, but it might be a bit of a lawyerly dodge given that when Chris Wallace asked him about the memo on March 20th, on Fox News Sunday, he said he’d never saw it before. The relevant excerpt:

WALLACE: Senator, how do you explain, then, these talking points, which have been circulated among Republican senators? And let’s put them up on the screen, so our viewers can see them.
Among the talking points: This is an important moral issue and the pro-life base will be excited.
And this is another one of the Republican talking points: This is a great political issue, because Senator Nelson of Florida — who’s a Democrat up for reelection next year — has already refused to become a co-sponsor. And this is a tough issue for Democrats.
Senator Martinez, these talking points sure look political.
MARTINEZ: And I reject those. I’ve never seen them before today. And I’ll tell you, they’re not a part of what I think this case is about.