House Majority PAC, the group that helps House Democrats, is making $43 million in TV reservations in 33 media markets for the final weeks of the 2018 campaign.

These initial reservations will be placed over the course of the month, which is the earliest the super PAC has booked time for the fall.

Reserving early allows HMP to lock in lower rates in some expensive media markets. In 2016, it made fall reservations in eight markets on March 30. In 2014 and 2012, it made its reservations in mid-April and July, respectively.

“2018 will bring a barrage of frantic negative attack ads from GOP outside groups, but HMP is ensuring we’re prepared early-on to fight back,” executive director Charlie Kelly said in a statement. “Momentum is on our side, and with smart, strategic investments, we will help Democrats win across the country.”

The reservations, which could change as the cycle develops, include broadcast and cable.