Sen. Dick Lugar (R-Ind.) is barely leading his primary opponent, state Treasurer Richard Mourdock, less than two months before the primary, according to a Democratic poll released today.

The numbers showed the six-term Senator in rough shape but still ahead of Mourdock, 45 percent to 39 percent.

Lugar faces the toughest re-election campaign of his career in the May 8 primary. Since the start of this cycle, Republicans viewed him as vulnerable in a primary, but polling of his race has been scarce in part because Indiana law restricts automated calls, including polling.

The pollster also noted that Lugar’s lead has been cut in half from a similar poll in October, which showed Lugar leading Mourdock by 12 points, 48 percent to 36 percent.

The new survey took the opinion of 500 likely Republican primary voters in Indiana from March 12 to 15.