The State of the Union address. All the standing up and sitting down is so the clap-happy audience gets a chance to give their brains some air.
And cribbing directly from Americablog:
Tonight I ask you to pass legislation to prohibit the most egregious abuses of medical research – human cloning in all its forms … creating or implanting embryos for experiments … creating human-animal hybrids … and buying, selling, or patenting human embryos.
Seems that he wants to make sure we don’t mate any more humans with chimpanzees.