Here's a fine example, courtesy of Think Progress:
In an interview with Streetsblog Capitol Hill, one radical conservative has declared yet another common public good to be unconstitutional: bike paths. In an interview about federal transporation issues, Streetsblog asked Rep. Duncan Hunter (R-CA) about supporting legislation that would support things like bike trails. Hunter responded by saying that he doesn’t “think biking should fall under the federal purview of what the transportation committee is there for. If a state wants to do it, or local municipality, they can do whatever they want to. But no, because you have us mandating bike paths, you don’t want either.”And the punchline:
STREETSBLOG: But you’re OK with mandating highways?No, I don't even have a clue what he's talking about, but that's OK because the Constitution!
HUNTER: Absolutely, yeah. Because that’s in the constitution. I don’t see riding a bike the same as driving a car or flying an airplane.