What wingnuts find so utterly galling is that -- not only are the Obamas back in the White House for another four years -- they're immensely popular people. Which is why, much to wingers like Monica's chagrin, they tend to be invited to "national events."
But beyond the obvious correlation between "millions of Americans really liking you" and "getting invited to stuff" is the precedent for appearing at the Oscars set by Ronald Reagan in 1981 and Laura Bush in 2002.
But, you know, IOKIYAR.