Here's a NYT article from this afternoon about the two Colorado primaries:

Two Senate primaries that were supposed to be tranquil affairs have turned into roaring Rocky Mountain shoot-outs that could provide the best test yet of how deeply anti-establishment, anti-Washington sentiment is running this year.

With the fierce duels to be settled Tuesday, independent analysts and party operatives say the contests between Republicans Ken Buck and Jane Norton and Democrats Michael Bennet and Andrew Romanoff are close, making it uncertain which two contenders will be left standing to compete in November for a seat that appears up for grabs.

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Close Senate Races to Test Depth of Voter Discontent

By CARL HULSE

Published: August 8, 2010

www.nytimes.com/2010/08/09/us/politics/09colorado.html