Will Schumer's no on Iran deal end clear path to be next Senate Democratic leader?

House Minority Leader Nancy Pelosi and Sen. Chuck Schumer are the two most influential Democratic voices on Capitol Hill.

They find themselves on opposite sides when it comes to support for President Obama’s Iran deal. Pelosi backs the accord. Schumer announced -- during Fox News Channel’s prime-time GOP presidential debate -- that he would oppose the agreement.

And regardless of where Pelosi, California, and Schumer, New York, stand on Iran, that mi