Christians Pray for Death of Americans United Staff

From Atheist Revolution:

You can put this in your "and Christians accuse us of not being moral?" file. Americans United for Separation of Church and State complained to the IRS that California pastor Wiley Drake was violating federal law by using his church to campaign for Christian extremist candidate Mike Huckabee. Drake's response was to once again call for imprecatory prayers against Americans United staff. That's right - this Southern Baptist Pastor is asking his followers to pray for the deaths of AU's staff.

From the Americans United press release:

Wrote Drake, "In light of the recent attack from the enemies of God I ask the children of God to go into action with Imprecatory Prayer. Especially against Americans United for Separation of Church and State…. Specifically target Joe Conn or Jeremy Learing [sic] and their leader Rev. Barry Lynn. They are those who lead the attack."

(more)

Granted it's a little indirect, but would this constitute a death threat for legal purposes?