The Koch network of policy and political organizations is pouring tens of millions of dollars into the midterm elections through grassroots arm Americans for Prosperity, primarily to boost Republican congressional candidates who share its agenda on key issues.

In an interview, Americans for Prosperity honcho Emily Seidel detailed the group’s strategy for boosting the ranks of like-minded politicians in the House and Senate and explained the criteria for determining which primaries and general election contests to endorse in — and invest in. Americans for Prosperity employs 400 full-time field staff across 35 states and plans to spend most of its cash earmarked for 2022 on direct voter contacts in 300 races across the country.