I don’t think the two are related other than both being left wing nut jobs. The Kos ranter appears to be at least a few years older and states that they have donated to Giffords’s campaign. There is no record of a Jared Loughner from Arizona having donated to her campaign. Of course, like most liberals, he could have been lying to impress the other liberals.
If the DHLS is retreiving and scrubing his postings, what makes you think the FEC wouldn’t do the same thing?