AP Photo/Michael Conroy

Candidates for Indiana's U.S. Senate seat Democrat Joe Donnelly, center, greets Republican Richard Mourdock, left, and Libertarian Andrew Horning following a debate in Indianapolis, Monday, Oct. 15, 2012. (AP Photo/Michael Conroy) (October 18, 2012)

INDIANAPOLIS (AP) — The Indiana Debate Commission is keeping Tuesday's Senate debate open after union members obtained 300 of the 500 available tickets.

The Indianapolis Star quotes (http://indy.st/RYA56b) the campaigns of Democrat Joe Donnelly and Republican Richard Mourdock as saying commissioners informed them of the decision Thursday.

The commission considered closing the debate after United Auto Workers members scooped up most the tickets for the event at Indiana University Southeast in New Albany.

UAW regional director Ken Lurtz says said the union abided by the ticket rules. He says it has no intention of disrupting the event.

Mourdock campaign aide Brose McVey says the commission will strengthen security for the debate.

Donnelly supported the federal loans and bankruptcy settlement that kept Chrysler and General Motors afloat. Mourdock unsuccessfully fought the matter in court.

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Information from: The Indianapolis Star, http://www.indystar.com