 President Biden's weak performance in last week's debate could have a big impact on Capitol Hill. Much of the talk since last week's debate has been about how Joe Biden's performance may have weakened his own chances for reelection. But among lawmakers, the focus is on how Biden's declining fortunes could impact individual races and majority control, especially in the Senate. That's where Republicans simply need to flip seats in either Montana or Ohio, in addition to their assured flip in West Virginia, to regain the majority.