Hillary Clinton logo typeface APR 14 2015
From his Twitter stream, it appears that Wolff is attempting to make an actual Hillvetica font so stay tuned. FYI, Pentagram partner Michael Bierut designed the logo. The simplicity is appealing, but overall I am not a big fan of the arrowed H.
Update: The Washington Post made a little text editor so you can write whatever you want in Hillvetica. The Clinton campaign has already put it to use: