Here's a peek at the blossoming art of online "behavioral targeting." In this case, the digital trails of visitors to the campaign websites of Obama and Clinton were tracked to see where else they browsed online. It seems that Clintonites are into real estate, while Obama visitors are into tech content.

The full analysis is here.

Only these two sites have enough visitors at this point for such tracking to be possible.

What BT ultimately means, though, is that browsing patterns of a candidate's backers that are not immediately apparent could be identified and used to target other likely prospects for that candidate ... relying on the "birds of a feather" maxim.

Soon, we'll know which candidate's web visitors are most into music downloads, which are into environmental content, which are into porn!