The Chafee vs. Laffey primary (which I keep bringing up at every reasonable opportunity) isn't until September 12, whereas Connecticut -- and admittedly Michigan -- are only a week away.  When we were still six weeks prior to Connecticut, there wasn't all that much national media coverage on that race yet, either; the trigger point was Lieberman's announcement that he was going for the independent petition drive over the Fourth of July weekend.

And, not to completely justify the lack of media coverage, but neither Chafee not Schwarz were ever on a national ticket, nor have they made themselves regular features of the political talking heads circuit.