7 p.m. — Who's nastier?  Ex-Bush spokesman Ari Fleisher and Ex-Clinton spokesman Lockhardt spar a bit on this on MSNBC.  Fleisher contends that Obama's repeated lines that tag McCain as a Bush acolyte are just as negative as Palin's “palling with terrorists” line used again Obama.  Lockhardt claims that the negativity can be “measured” — most McCain ads attack Obama, most Obama ads talk about Obama's policies and values.  Another topic, less covered, amounts to negativity in the service of inciting extremist supporters.  Conservatives are taking umbrage (see Michelle Malkin) after various commentators (e.g. Obermann) attack McCain-Palin for not doing more to rein in their own supporters when they shout “kill [Obama]” at Republican rallies.  Malkin claims there's just as much nastiness on the Democratic side.  Obermann last night called McCain a “fraud” for allegedly failing to address the issue.