Senate Minority Leader Chuck Schumer (D-NY) is the key lawmaker in brand drug makers’ play to get Congress to lower their share of seniors’ drug costs, sources on both sides of the lobbying effort say. House Democrats and Sen. Ron Wyden (D-OR) are trying to block brand drug makers from being handed a win on Part D changes, and House Minority Leader Nancy Pelosi (D-CA) insists that brands agree to additional measures that ban pay-for-delay, add a Medicare Part B...