Cruz’s super PACs, Keep the Promise, have raised only around $2 million in the second half of 2015, according to two people familiar with the figures. The groups have raised up to $5 million in the month of January, the sources said.

That’s a far cry from the $38 million raised in the first half of 2015, most of which came in the opening days of Cruz’s bid.

That sum for Keep the Promise is a significant slowdown and shows the group has not expanded much beyond the original anchor donors that made the group into a surprise story of early 2015. Three families are responsible for $36 million of the roughly $40 million the super PACs raised in 2015, and it does not appear additional donors of the same scale have been landed during the second half of 2015.