Meanwhile, Mayor Dana Rinehart of Columbus, Ohio, who admitted to having an extramarital affair with a member of his cabinet, has decided for a second time not to seek reelection this year.

The 44-year-old Republican said he was concerned that his personal life would dominate the campaign. Appearing at a news conference with two of his children and his mother, Rinehart said, "That's enough. There isn't any of me left. I'm not willing to sacrifice him or her or my other son or my mom. I'm done. I'm history."

Rinehart, who did not rule out seeking office in the future, acknowledged that he might not have been able to raise enough money for a campaign because of publicity about his personal life. Two other Republicans have said they will seek the office.

"Yes, it became apparent to this stubborn, proud, combative Marine that the only route to victory, if there was such a road, lay across a bloody battlefield," Rinehart said.

Rinehart, a lawyer with the Marine Corps reserves, said he expected to be called to active duty.

Rinehart first said last July that he would not seek a third consecutive four-year term. He cited family, financial and political reasons. A month later, he and his wife announced a separation. But in December, although his affair with Human Services Director Brenda Dodrill had just been revealed, Rinehart said he had reconsidered his decision and planned to run.