Republicans crossed a Dangerous Line by Sabotaging Foreign Policy - Ezra Klein

http://www.vox.com/2015/3/9/8177815/republicans-foreign-policy-sabotage

Republicans are overtly sabotaging not just  Obama's Iran policy, but also his constitutionally enshrined authority over foreign policy. This is unprecedented. If the trend continues — Republicans have already extended their efforts to Obama's relationship with Israel — it endangers not just US policy toward the Middle East, but the very way that the United States makes foreign policy.
The possible implications for the United States and its role as global leader should worry Americans of every political stripe.

Republicans are adapting the tactics they used against legislation like Obamacare to Obama's foreign policy

 Had Democrats done a similar thing when GW Bush was talking about invading Iraq, the Dems would have been brought up on charges.