According to data from the Centre for Responsive Politics, oil and gas PACs have contributed around $14.2 million to candidates seeking local, state and national office in 2016, compared with nearly $15 million in 2012, the last time a presidential election was held.

PACs attached to companies will often give to committees trying to elect candidates in energy-producing states or who have strong pro-energy platforms, Federal Election Commission (FEC) data show.