Three groups backing Gov. Scott Walker have collectively raised $32 million in the first half of 2015.
Groups raise $32M for Scott Walker
A group backing Scott Walker for president has raised $20 million.
Three billionaires are the top contributors to a super PAC aligned with Gov. Scott Walker's presidential campaign.
Unintimidated PAC is making an advertising purchase in Iowa of nearly $7 million.
The GOP candidate touted his Midwestern roots, but also was confronted about his views on immigration.
The response this time in Iowa was more subdued.
The state is a must-win for Walker, who launched his campaign on Monday touting his winner/fighter record.
Scott Walker said he made his formal announcement today "after a great deal of thought and a whole lot of prayer."
