This is an issue of trademark, not copyright.
Stylized letters don't qualify for copyright protection.
In a circular published by the US Copyright Office, in the section that describes things that cannot be protected by copyright, it includes "mere variations of typographic ornamentation, lettering, or coloring..."
Regarding trademark, Hillary For America has applied for two trademark registrations for the 'H' logo, one in color (86595041) and the other in black & white (86595037). They were not listed as officially registered as of December 2016. HFA has filed the logo as an "Intent To Use" rather than an "In Use" mark. And they have filed two 6-month extensions since then. They can do this for three years before they have to file a "Statement Of Use." Otherwise, the mark will be considered "abandoned."
Though the 'H' logo is not registered, that doesn't mean that it cannot be protected.
The test for trademark infringement is whether a competing mark is "confusingly similar." In other words, would a person looking at a similar mark conclude that it came from or represents Hillary For America. Would an
"I'm For Him" T-shirt with the logo be confused with HFA or would it be seen as humor? I know what I would think.
The real question I have is why HFA didn't finish the process of registering the logo in the first place. It is not because it's cheaper to file an "Intent To Use." It's actually more expensive than a simple "In Use" application. And each extension costs 150 dollars for each category that's claimed. I counted 12 categories just for the color logo (times two extensions so far). Why not just finish the registration process and be done with it?
Interestingly, Donald Trump filed a trademark registration for the phrase "Make America Great Again" in 2012, just six days after President Obama defeated Mitt Romney to win a second term of presidency.
Trump has filed many trademark applications, something like 170, mostly in connection with his businesses. Many of them are dead. Two that made me smile: Trump Vodka, and Trump The Fragrance.
Make America smell great again?
Brad in Kansas City