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Two competing proposals to avert the crisis emerged in the Senate last week, but lawmakers left town before voting on either.

A bipartisan group of six senators — including Republican Sen. Lamar Alexander of Tennessee and Democratic Sen. Joe Manchin III of West Virginia — put forth a bill to tie interest rates to financial markets with a cap of 8.25 percent.

Sen. Tom Harkin, Iowa Democrat and chairman of the chamber’s Committee on Health, Education, Labor and Pensions, countered by joining with 37 other Senate Democrats in proposing a one-year measure to lock interest rates at 3.4 percent.