I think Tom Lantos has been a problematic force, especially given his commitee chairmanship, on foreign policy issues these past few years, but at first glance a
primary challenge doesn't seem particularly promising to me since, as
Kos and
Stoller note he's very liberal on domestic issues so there's not a ton of vulnerabilities there ... it's a hawkish attitude toward the broader Middle East and apparently complaints about inattention to the district and not much else.
This article available online at:
http://www.theatlantic.com/politics/archive/2007/11/challenging-lantos/47099/