To criticize our president . . .
is not only "endorsed" by Teddy Roosevelt as in your quote from him, but is also the most highly protected form of "political free speech" under the first Amendment. All criticism of the President ala politics is completely protected under the 1st Amendment, unless you are threatening him (or her, in the future) with immediate harm.
While many friends on this Zeev thread are seeing some rally action ahead this week, I see only doom. But then my glasses are pretty dirty (gig).