Fears about this radicalising effect of partisan primaries lay behind the victory on the same day of a ballot measure, Proposition 14, to change to open primaries.

由于担心党派初选的激进作用会让胜利远离在同一天举行的选举，所以14条提案建议让初选公开化。

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But since Chile has no previous experience of open primaries, pollsters are not so sure.

ECONOMIST: Consternation

Both states held open primaries, which meant Republicans, independent voters and Democrats could cast ballots in the GOP contests.

CNN: 'We did it again': Santorum wins Alabama, Mississippi

The Conservative leader has previously spoken in favour of open primaries - based on the system used in some US states for selecting party candidates.

BBC: Tories to stage 'open primary'