Julian Zelizer : Midterm elections could change the balance of power in Congress . Zelizer : Bush campaigned on Ronald Reagan 's record and essentially promised to do more of the same , just in kinder and gentler fashion . If Democrats win , they can force compromise ; if GOP wins , it can torpedo Obama . Comment: Zelizer : Elections will also offer a huge stage for possible presidential candidates .
Julian Zelizer : Midterm elections could change the balance of power in Congress . Zelizer : If Democrats win , they can force compromise ; if GOP wins , it can torpedo Obama . Comment: Zelizer : Elections will also offer a huge stage for possible presidential candidates .