Senate Democrats indicate they’ll be spending big playing defense in four states this fall. Burgess Everett reports at Politico:

The DSCC is reserving $8.4 million in Nevada, $7.5 million in Arizona, $7 million in Georgia and $4 million in New Hampshire, according to a DSCC aide. The party is also going on offense in two states, reserving $3 million in Pennsylvania, which is an open seat due to the retirement of Republican Sen. Pat Toomey, and $3 million in Wisconsin, where GOP Sen. Ron Johnson is running for reelection.
The initial reservations are just the first chess move by Senate Democrats and, like other groups, the DSCC is likely to add to and modify its ad campaigns as the Senate map develops. North Carolina is still considered a battleground. And Democrats are closely watching states like Ohio and Florida to see if they become competitive, while Republicans are eyeing Colorado and Washington state.

It’s a sign of the currently favorable political environment for Republicans that Democrats haven’t yet booked any spending to target GOP-held seats in North Carolina, Florida, and Ohio.