Religious Conservatives Praying for Death and Failure

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What is with the Christian tactic of praying for someone's death or failure?

Recently, religious conservatives have taken to praying for someone's death or at least for them fail. A few recent examples of this Christian virtue at work:

Sen. Tom Coburn (R-Okla.)  Proposes a Prayer on the Senate Floor
Conservatives Pray for Obama's Death
DeMint Attends Prayercast to Defeat Health Care Bill
Michelle Bachman: Prayer and Fasting will Defeat Health Care Reform  
Rush Prays For Obama's Failure

I think, like gun control, we should have a seven day waiting period for prayer.