This is quite interesting, from a Frank Luntz focus group:
Our 30 swing voters were given "people meters" -- small, handheld dials that they turned up or down to register their second-by-second reaction to speeches, news clips or party political broadcasts. Up is good. Down is bad.
We showed them the first few moments of the recent White House press conference where President Bush and Mr Blair stood side-by-side and talked about "a clear way forward" in Iraq. The dials plummeted. Never in 17 years of moderating people-meter sessions have I seen an audience react so negatively even before the first word had been spoken. Every dial fell.
I can see it now: Lib Dem posters plastered throughout traditional Labour constituencies of a smiling Tony Blair looking wistfully at a smirking George W. Bush over a simple four-word slogan: "Need we say more?" Trust me, it would work.
I can't wait to get out there.