“Despite efforts to reach a compromise, the obstructionist refused to allow any progress in the Senate, derailing the intended goals of the proposed legislation.”
obstructionism
A deliberate policy of obstructing something, especially a political process or body.
“In real life deployments, the network performance bottleneck has gradually become the key obstructer for virtualization of larger scalability.”
“Therefore, they obstruct each other's efforts to achieve their goals because such obstruction makes it more likely that the obstructer will achieve his or her goals.”