CNN’s John King is reporting that sources tell him Liz Cheney will be dropping her bid to become one of Wyoming’s US senators.

Cheney’s campaign had gotten off to a rough start, most visibly with jabs traded with her own sister, Mary Cheney, over Liz’s views on marriage equality. (Mary is married to a woman, Liz is opposed to same-sex marriage.) But more to the point of a political primary, Liz’s move to Wyoming from Virginia in 2012, and her association with her famous father made her challenge against a conservative Republican a difficult one. Dick Cheney was a five-time Wyoming Congressman as well as US vice president, and his help in the campaign didn’t seem to be helping, King notes: “Cheney, like her father, is an unapologetic neoconservative who favors muscular use of American military power overseas, a policy that does not sit well with many grassroots conservatives, particularly in the libertarian-leaning West.”

A couple of informal polls had suggested that Cheney was many points behind incumbent Mike Enzi, and even the help of her father was going to make it difficult for her to make up ground.

CNN says a formal announcement from Cheney could come as soon as tomorrow.