CHICAGO — Illinois received $6.1 billion in bids from 128 investors on its sale this week of $3.7 billion of taxable eight-year general obligation bonds to cover its 2011 pension contribution, a level the state touts as a sign of investor confidence following an income tax increase.

Some market participants counter that the chief draw was the paper's yields relative to comparable corporate credits with similar maturities. It is likely a mix of both factors, several traders and analysts said.

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