A new poll of likely Iowa Republican presidential caucus goers finds a wide-open field with three candidates vying for the top spot and a plurality undecided. Scott Walker, the governor of neighboring Wisconsin, leads the latest poll from Loras College, earning 12.6 percent support. Florida senator Marco Rubio, who declared his candidacy earlier this month, is close behind with 10 percent, while former Florida governor Jeb Bush has 9.6 percent.

Both Walker and Rubio have doubled their support from the January Loras poll, according to a press release from the college.