National Journal reports on a new poll that shows incumbent Indiana senator Dick Lugar leading his primary rival, state treasurer Richard Mourdock, 44 percent to 42 percent. The group behind the poll, the Lunch Pail Republicans, is a pro-labor organization supporting Lugar.

A Mourdock-sponsored poll released last week showed Mourdock ahead of Lugar, 44 percent to 39 percent. The GOP primary on May 8 remains very close.