Scott Walker Has Early Lead in Iowa Poll as Jeb Bush Faces Challenges

Marco Rubio is a popular second choice, a potential indication of strength if he can convert that support to his own.

Scott Walker, governor of Wisconsin, greets an attendee during the Chad Airhart Blue Jean Bash fundraiser in West Des Moines, Iowa, U.S., on Saturday, May 16, 2015.

Photographer: Daniel Acker/Bloomberg
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Wisconsin Governor Scott Walker has expanded his early lead in Iowa, while former Florida Governor Jeb Bush continues to face headwinds and Senator Marco Rubio of Florida shows upside potential in the state that hosts the first 2016 presidential nomination balloting.

A new Bloomberg Politics/Des Moines Register Iowa Poll shows more than a third of likely Republican caucus participants say they would never vote for Bush—one factor in a new index to assess candidate strength in such a crowded field. Forty-three percent view him favorably, compared to 45 percent who view him unfavorably.