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Control of House could hinge on rematches in 10 races.
Schumer is largely credited as the architect of Democratic wins in 2006 and 2008.
Ad spending by GOP allies over the past two months has totaled nearly $30 million.
Those in New York and closest to the controversy are staying silent or scrambling away.
The show of support for Rangel included Sens. Schumer and Gillibrand, who will face voters in November.
New York may be strongly Democratic but the party could lose as many as eight House seats in the state.
Some question whether the money could have been better spent.
National Journal unveils their most liberal and most conservative members of Congress.