Six Weeks to the Midterms: A Polymarket Analysis of the 7.5% Republican Sweep Lane

With the November midterms roughly six weeks out as of September 22, 2026, the most interesting board on Polymarket right now isn't a single yes/no question — it's a partitioned one. The 2026 Balance of Power: R Senate, R House lane is trading at 7.5%, down five points on the week, with $3.75 million in cumulative volume and $590,920 of liquidity sitting behind it.