DENVER (AP) — Billionaire Tom Steyer electrified the political world with his promise to raise and spend as much as $100 million to make climate change an issue in this year's midterm elections.

The former hedge fund manager is running out of time.

On pace to raise far less money, Steyer's group has a relatively minor presence on the air. He now says his biggest impact will be an old-fashioned, get-out-the-vote ground game.

But Steyer's burgeoning political operation will focus on only a handful of races, bypassing several coal- and-oil rich states where Democrats are in highly competitive Senate contests that could determine control of the chamber.

While he's still outlining his plans for staff and volunteers, his free-spending conservative opponents have been at work wooing voters for months.