Walker—unable to arrest his sliding poll numbers after the second GOP debate—ended his White House bid Monday evening. He called on other GOP hopefuls with lower poll numbers to do the same "so the voters can focus on a limited number of candidates who can offer a positive conservative alternative to the current front-runner," taking a shot at Donald Trump without mentioning him by name.
In the RealClear Politics polling aggregator, Trump still leads the crowded field by a wide margin with 28.5 percent support. Huckabee comes in seventh with 4.8 percent.
After Walker's announcement, Jeb Bush rejected the notion that he might leave the race. The former Florida governor has 7.8 percent support and is in third place, according to RealClear Politics.
Former Texas Gov. Rick Perry dropped out before last week's CNN debate.