I do not think winning one seat in the Senate will result in changing the basics. he democrats have 59 seats and the Republicans 41. What it does do is prevent some misuses of Presidential power. However, Obama follows his own rules and no one seems to pick up on this. His appointment of "Czars" without congressional approval is, to my mind, completely illegal under the US Constitution.
Thailand arrests five for trafficking women into sex slavery in China (Reuters)
from the article: Obama's lost senate seat is a victory for Netanyahu