Has there been a single mainstream comic book or superhero product that hasn't been, not just respectful, but completely solicitous of the current president?
Oh, hell, yes. In 1973, during the Watergate scandal, Steve Englehart did a storyline in
Captain America that culminated with
the following:
After several issues, Captain America defeats the organization and in July 1974’s issue #143 unmasks their leader—then-President of the United States, Richard Milhous Nixon.
Note that this was not a clone, not a robot, not a shape-changing alien imposter or mirror-universe doppleganger. This storyline suggested that the sitting President was a supervillain seeking the overthrow of the United States.
At the height of the confrontation Nixon commits suicide rather than face arrest. He is replaced by a double, and the Watergate scandal is engineered to allow the imposter to “resign” rather than let the public know how close America came to Armegeddon.
Not to mention
The Dark Knight Returns, published during the Reagan administration, which featured a scathing caricature of Reagan as a reckless and incompetent warmonger.
EDIT: Looking at your post again, I suspect you meant "the current president" to mean President Obama, not "whoever was the current president at the time the comics were written." Still, just in case, I'll let my comments stand.
