People overwhelmingly prefer reversible decisions to irreversible ones.

FORBES: Why Keeping Your Options Open Is Really, Really Bad Idea

Romney's campaign has acknowledged its problem with African American voters: Polls show blacks overwhelmingly prefer Obama -- a recent Gallup tracking poll showed just 5% of blacks supporting Romney, compared with 87% for the president.

CNN: Romney draws boos from NAACP, support from conservatives

Lib Dem supporters are overwhelmingly in favour of AV, Labour ones prefer it slightly, and Tory backers are broadly against it.

ECONOMIST: Voting reform and the coalition