As Republicans and Democrats prepare for next year’s midterms, December’s special elections have both sides strategizing for success. Democrats hope to build on momentum from recent wins, while Republicans are determined to assert their competitiveness ahead of the bigger contests to come.

Sen. Adam Schiff (D-Calif.) is challenging Republicans’ decision to redraw congressional districts in Texas, arguing that they view it as a near-certain strategy to hold onto power. While California also adjusts its districts, Schiff says Democrats have already supported legislation that would end gerrymandering nationwide.