McGrath, a former Marine fighter pilot, has raised more than $17 million in the second quarter as part of her effort to unseat Senate Majority Leader Mitch McConnell, R-Ky., but continues to trail in the polls, according to Politico.
The candidate's new manager is Dan Kanninen, a veteran of the campaigns for both Hillary Clinton and former President Barack Obama. He will be taking over for Mark Nickolas, the campaign said.
Kanninen also worked on former New York City Mayor Mike Bloomberg’s failed presidential bid earlier this year.
Nickolas will stay on the campaign as a senior adviser, according to The Hill.
McConnell’s campaign quickly fired back at the news.
“They needed to find someone with better expertise in lighting millions on fire,” his campaign tweeted in an apparent reference to Kanninen's work on Bloomberg’s expensive run.
Kanninen issued a statement as well.
“There is no more destructive force in Washington than Mitch McConnell — he is the architect of the dysfunction that is hurting Kentuckians,” Kanninen said in a statement, according to Politico. “Amy has served her country for more than 20 years, and she will continue to fight for Kentucky as senator. I’m honored to be a part of that fight.”
McGrath was the favorite heading into Kentucky's Democratic primary in late June, but she was forced to spend considerably more than planned on an unexpectedly tough challenge from Kentucky state Rep. Charles Booker, a progressive who attracted support from U.S. Sen. Bernie Sanders and U.S. Rep. Alexandria Ocasio-Cortez.
McGrath beat Booker by three percentage points.
Two recent general election polls both have McConnell leading McGrath by 5 percentage points and 17 percentage points.