I think Cameron’s purple is allied to the Conservative party. They have long claimed to be the ‘law & order’ party. In the UK the colour purple has for centuries been held to be the colour of the judiciary, i.e. law & order.

Brown’s pink is merely a softer ‘red’, which may have been an overt attempt to appear softer after reports in recent months of his aggressive attitude. of course, it could also be an attempt to attract the female, or even the gay vote.

There may be some truth in what you say, Don, but I suspect it is way down in the subconscious of those involved. Politicians and their ‘advisers’ tend to treat the electorate like kindergarten kids and usually forgo anything so subtle.

Thank you for the video embed.

Yes they may try to stay close to their party’s color spectrum during the debates. Notwithstanding I don’t believe that the purple tie David Cameron wore in the second debate represents the Conservative Party colours, nor does the pink Gordon Brown wore in the first debate represent the Labour Party. That’s all part of the game. However with the reds for example, pink, bright red and maroon all communicate different emotions to the viewers. See BodyLanguageTV.com – Tie Color for more in depth analysis of the red spectrum ties.

Don