Brad Herold, who shepherded Republican Senate candidate Mike McFadden's surprise endorsement, has stepped down as McFadden's campaign manager.

Herold came from Florida to run McFadden's campaign in September. He will now become a senior advisor to the campaign, said McFadden spokesman Tom Erickson.

"Brad is still a member of the McFadden for Senate team. Our plan has always been to retool the campaign after becoming our party’s nominee," Erickson said.

The McFadden shake up was first reported by the Morning Take e-newsletter.

Erickson said Herold will advise McFadden in his quest to oust Democratic U.S. Sen. Al Franken.

"Brad will still be involved in his new position as a senior advisor to the campaign. We look forward to making an announcement about our new campaign manager in the coming days," he said.

Photo: Senate candidate Mike McFadden at the Republican party convention in May / Source: David Joles, Star Tribune.