The Indiana Senate race continues to be a tight battle, with a slim edge for Democratic Rep. Joe Donnelly over Republican state Treasurer Richard Mourdock.
Donnelly leads 40 percent to 38 percent, plus 7 percent for Libertarian candidate Andrew Horning, in a Howey/DePauw poll released Thursday. The survey of 800 likely voters was conducted Sept. 19-23, and has a 3.5 percent margin of error.
The same poll shows Mitt Romney leading President Obama, 52 percent to 40 percent. However, Mourdock appears to be having a hard time sealing the votes of people who had supported longtime GOP Sen. Dick Lugar, whom Mourdock defeated in the primary. Among Lugar primary voters, Mourdock leads only 60 percent to 15 percent, compared to Romney carrying this group 86 percent to 10 percent.
The PollTracker Average shows Donnelly narrowly ahead, 41.7 percent to 39.3 percent.