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The states in the middle of the Interstate 70 corridor represent a strikingly cohesive group of voters who were instrumental to the Democratic sweep of Congress in 2006 and President Obama's election in 2008. The results of the 2010 midterm elections here will have great influence over who holds power in Washington next year, and ultimately who sits in the Oval office after 2012. Use this map to explore the region's key congressional races:

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*Incumbent. NOTE: FEC Data as of
. SOURCE: Federal Election Commission. GRAPHIC: Wilson Andrews, Dan Keating, Gene Thorp and Karen Yourish.
The Fix
Politics headlines
Interactive maps of national races

House

Will Republicans take control of the House in 2010? Post reporters Dan Balz and Chris Cillizza will weigh in regularly on the 25 races you need to know about.

Senate

Stay on top of the 36 Senate seats up for grabs with exclusive race rankings by The Post's Dan Balz and Chris Cillizza.

Governor

Use this tool to view election history, see upcoming primaries and analyze key demographics.