Liz Cheney Is Already Abandoning Her Senate Run

Liz Cheney, the eldest daughter of former Vice President Dick Cheney, is preparing to end her longshot bid to become a U.S. senator from Wyoming, CNN's Peter Hamby and John King report.

According to the report, an official announcement could come as soon as Monday. A Cheney campaign spokeswoman didn't immediately respond to a request for comment.

Cheney's exit would mark the end of a disastrous five-month campaign to challenge incumbent Republican Sen. Mike Enzi in the primary.

Her campaign was perhaps most notable for the family feud it begat, when Mary Cheney, who is gay, unloaded on her sister over Liz's opposition to gay marriage.

"Liz - this isn't just an issue on which we disagree - you're just wrong - and on the wrong side of history," Mary Cheney wrote in response to Liz's comments about gay marriage in an appearance on "Fox News Sunday."

Mary later told The New York Times in an interview that the two sisters haven't spoken since summer, and that it would be "impossible" to reconcile with Liz unless her position changed.

There was little public polling conducted on the race, but each public and partisan poll showed Enzi with wide leads.

The primary election in Wyoming is Aug. 19.