There's a small taste of the complications in a footnote to the House-Senate conference committee report that's been dubbed the "Starbucks" provision.

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Baucus should be very aware of this from his experiences during the 1990 House-Senate conference committee on Clean Air Act amendments, when he failed to persuade the Senate to adopt language requiring the EPA to set CO2 emission standards for motor vehicles.

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The threat comes nearly a year after the shootings at Littleton, Colorado's, Columbine High School, and eight months after the one meeting of the conference committee charged with working out differences between the House and Senate versions of the juvenile-justice bill that contains the gun control provisions.

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If the Ney-Wynn bill passes, lawmakers would have to go through a conference committee to reconcile differences between the House and Senate versions.

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