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COLUMBIA, S.C. (AP) - Three challengers to U.S. Sen. Lindsey Graham are signing an agreement that if any of them make a runoff against the Republican incumbent, the other two will throw their support behind the challenger.

Roebuck Sen. Lee Bright, Anderson businessman Richard Cash and Orangeburg attorney Bill Connor will sign the deal Thursday morning at the Statehouse.

A recent Winthrop University poll showed Graham with a large lead, but not quite the 50 percent needed to avoid a runoff after the June primary. However, the same poll showed one-third of likely Republican voters polled have not made up their minds, and the four remaining challengers were in single digits.

Lowcountry businesswoman Nancy Mace did not sign the pledge. She says it would be a disservice to her supporters to think about losing.

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