This American presidential election is deadly serious. Even if one party’s candidate appears to have emerged from a Ronco countertop rotisserie, and his ideas might as well have come from there too, the whole thing is too ugly and scary to really be a joke. The Republican National Convention, however, is a whole other story. When the first item listed on a host committee’s “find a supplier” page is called “The Cool Bus,” at least a few jokes are in order. Before the jokes: Yes, this whole thing is going to be a disaster and hopefully nobody gets hurts in…