With the number of presidential candidates down to five and the primary schedule starting to spread out, super political action committees have all but gone dark in the past seven days.

According to the Center for Responsive Politics, since March 21, only one the top 15 super PACs have spent any money to oppose a candidate. As many candidates have dropped out of the race, their affiliated super PACs have shut down as well, at least for the time being. One of the remaining active super PACs, Our Principles PAC, exists solely to oppose Donald Trump.