Coalition for Obama Split by Drift to G.O.P., Poll Finds

Critical parts of the coalition that delivered President Obama to the White House in 2008 and gave Democrats control of Congress in 2006 are switching their allegiance to the Republicans in the final phase of the midterm Congressional elections, according to the latest New York Times/CBS News poll.

Republicans have wiped out the advantage held by Democrats in recent election cycles among women, Roman Catholics, less affluent Americans and independents. All of those groups broke for Mr. Obama in 2008 and for Congressional Democrats when they grabbed both chambers from the Republicans four years ago, according to exit polls.

If women choose Republicans over Democrats in House races on Tuesday, it will be the first time they have done so since exit polls began tracking the breakdown in 1982.