Does the policy pendulum often swing with changes in the balance of power in Congress between contentives and liberals? For example, the Congressional ban on needle-exchange programs that was put in...

Does the policy pendulum often swing with changes in the balance of power in Congress between contentives and liberals? For example, the Congressional ban on needle-exchange programs that was put in place in 1988 was lifted in 2009 in the wake of the Democratic landslide victories in the presidential and congressional elections of 2008-but was imposed again in December 2011 as contentives regained control over the House of Representatives and increased their numbers in the Senate in the congressional elections of 2010.