Voting is underway now in the Senate on whether -- and how -- to investigate Rep. Don Young's Coconut Road earmark.

Late Update: The Democrats' preferred measure -- the Boxer amendment, which requests that the Justice Department initiate an investigation of how the earmark was sneaked into the bill after passage -- passes.

Later Update: A separate measure sponsored by Sen. Tom Coburn (R-OK) that would have created a joint House-Senate panel to investigate Coconut Road has failed.