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McCain leads Obama; Clinton steady

From NBC's Domenico Montanaro
The daily Gallup tracking poll shows McCain continuing to open up a lead over Obama (48%-42%) and holding steady with Clinton (46%-45%) as he has for at least two weeks. The Democratic match up remains essentially unchanged with Clinton maintaining a 48%-46% lead over Obama. Clinton led yesterday 49%-45% and 47%-46% the two days prior. Obama had held a 10-point lead a week and a half ago.