"I'm being called to lead to help to clear the field," Republican presidential candidate Republican presidential candidate Scott Walker says at news conference in Madison, Wis. Encourages others to drop out to foster a "positive conservative message" and rally around alternative to "current frontrunner" -- a reference to Donald Trump Walker, who's also the governor of Wisconsin, led field in Iowa as recently as July, according to Quinnipiac poll NOTE: Walker is the second declared Republican can
Source: Bloomberg.com news