Sen. Joe Manchin, D-W.Va., speaks on a proposed protection plan for people with pre-existing health conditions at a news conference in July. The fate of Obamacare could be decided by which party wins control of Congress in November.

Sen. Joe Manchin, D-W.Va., speaks on a proposed protection plan for people with pre-existing health conditions at a news conference in July. The fate of Obamacare could be decided by which party wins control of Congress in November.