Liz Cheney, the daughter of former vice president Richard B. Cheney, announced Monday that she has decided to end her bid to become a U.S. senator from Wyoming, citing "serious health issues" in her family.

Cheney's decision brings an abrupt end to a high-profile campaign that shook the Wyoming political landscape and unfolded against the backdrop of a deeply personal and very public rift with her sister over the issue of gay marriage.