Two super PACs backing Republican Rand Paul’s presidential campaign raised $5 million in the first half of the year, an official said, falling short of several top GOP contenders.

America’s Liberty PAC, the primary group backing the Kentucky senator, raised $3.1 million, while a second group, run by former FreedomWorks president Matt Kibbe, raised $1.9 million. The second group, called Concerned American Voters PAC, was launched June 1.