nonbinding

共和党の候補者選びが熱を帯びてきていますが、現在、先頭を走るRomney氏は再びSantorum氏への攻撃をはじめました。ここのnonbindingとはどのような意味でしょうか。大統領選と言えばSugiuchiくんです。お願いします。（ゼミ生 Temple Gate）
Romney campaign criticizes Santorum on health care claims
By Tom Cohen, CNN
February 6, 2012 -- Updated 1740 GMT (0140 HKT)
Mitt Romney's campaign is taking on criticism of his health plan in Massachusetts by Rick Santorum.

Washington (CNN) -- Mitt Romney's front-running campaign on Monday criticized trailing rival Rick Santorum for false remarks about Romney's health care plan in Massachusetts, showing concern the conservative Santorum might be poised for a strong showing in this week's Republican presidential contests.
The GOP hopefuls face caucuses in Minnesota and Colorado on Tuesday, along with a nonbinding primary in Missouri. On Saturday, Maine wraps up its caucuses, followed by a break until a February 22 debate on CNN and February 28 primaries in Arizona and Michigan.
http://edition.cnn.com/2012/02/06/politics/campaign-wrap/index.html