The DISCLOSE Act, which Murray has been plugging continuously for the last week or so, would have required TV attack ads to name their funders. The bill was written by Democrats in response to January’s Citizens United, ruling in which the US Supreme Court allowed corporations to directly fund political attack ads. (Josh wrote more about that here and here.)
The vote was 59-39, strictly along party lines: all the Democrats and both Independents (Joe Lieberman of Connecticut and Bernie Sanders of Vermont) voted for cloture; all but two Republicans voted against it. Those two, Lisa Murkowski of Alaska and Kay Bailey Hutchison of Texas, abstained from the vote.
See the full vote breakdown here.