A "progressive" advocacy group in the US has pledged to withhold millions of dollars in campaign contributions to Sen. Chuck Schumer as well as other Democrats should they vote in Congress against the nuclear deal with Iran. Close to 18,000 people have signed a petition on MoveOn's website, called "No money for war hawks," the group told the Huffington Post on Friday. MoveOn, which touts itself as a "community of more than 8 million Americans...lead[ing] campaigns for progressive change," has committed in this latest petition to withhold $8.3 million that it would have otherwise donated to the Democratic Party. The...