A new poll from Howey Politics and DePauw University shows Richard Mourdock leading Dick Lugar by 10 points in the Indiana Republican Senate primary. Among GOP primary voters, 48 percent said they would vote for Mourdock, the state treasurer, while 38 percent said they would vote for Lugar, the six-term incumbent senator. The poll shows Mourdock’s largest lead in the primary, which will be held on May 8. Here’s more from the Indianapolis Star:

The poll was conducted April 30 to May 1 of 700 likely voters by Republican Christine Matthews of Bellwether Research and Democrat Fred Yang of Garin-Hart-Yang Research Group. It has margin of error of plus or minus 3.7 percentage points.

The poll shows a dramatic slide for Lugar, who in his last election in 2006 won with more than 80 percent of the vote after Democrats considered him so unbeatable that they didn’t field a candidate against him.

According to the Star, the last Howey/DePauw poll showed Mourdock behind Lugar, 42 percent to 35 percent, just one month ago. More recent polls by both the Mourdock campaign and a Republican group supporting Lugar showed closer races.

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