WASHINGTON -- Liz Cheney abruptly ended her campaign to oust a veteran Wyoming senator of her own party on Monday, citing "serious health issues" in her family.
The decision by the daughter of former Vice President Dick Cheney ends a brief, long-shot election bid that tested her father's clout in the Republican Party and her relationship with her lesbian sister, Mary Cheney, over the issue of same-sex marriage.
A statement by Liz Cheney released Monday did not specify whose health was at risk or the nature of the problem, but implied it involved one of her children.
"My children and their futures were the motivation for our campaign, and their health and well-being will always be my overriding priority," she said.
Cheney, 47, announced in July that she would challenge three-term incumbent Sen. Michael B. Enzi, 69, in the GOP primary, citing the need for a "new generation" of leaders to fight for conservative principles.
Her most immediate problem was re-establishing a connection to Wyoming, where she grew up and which her father once represented in the House of Representatives. She had returned after years of living in the Washington area and struggled to overcome criticism that she had come only to seek public office.
A more significant hurdle was developing a case against Enzi, a staunch if low-profile conservative without the apparent liabilities that have inspired primary challenges to other GOP incumbents whom the right deems too moderate. A shift among the party's grass roots away from Dick Cheney's neoconservative foreign policy views also loomed as a campaign issue.
The former vice president had been playing an active role in the campaign, recently appearing at a Washington fundraiser to support a new "super PAC" being launched to boost the effort. He offered pointed criticism of Enzi in interviews, even disputing in one that the two men had been fishing buddies, as the senator had suggested.
Despite efforts by Cheney and her father to build support, many Wyoming Republicans and some of Enzi's Senate colleagues stood by him. A poll by a GOP super PAC in November, looking ahead to the August primary, found Enzi with a 52-point lead.
Cheney also had sparked a feud within her own family when she restated her opposition to same-sex marriage, after a conservative super PAC launched a television advertisement that questioned her position.
Her sister, Mary, who is married to a female partner, responded that Liz Cheney was "dead wrong" on the issue and later that she was "on the wrong side of history."
Dick Cheney and his wife said they were pained to see family divisions that they had "dealt with privately for many years" playing out publicly.
Now, Liz Cheney is citing family issues of a different sort for ending her candidacy.
"Serious health issues have recently arisen in our family, and under the circumstances I have decided to discontinue my campaign," she said.