Recent events have exposed Labour as sleazy, dishonest, vindictive careerists, only interested in grabbing power at any cost. I would not be at all suprised if further scandals come to light between now and the European elections, thus putting Labour on course for another electoral hiding.
You've mentioned candidate selection and this is another issue that is coming to light at present, with selections in Calder Valley and Erith and Thamesmead both appearing to have been nobbled.
http://www.guardian.co.uk/commentisfree/2009/apr/15/damien-mcbride-georgia-gould-labourThe suggestion is the article of Hazel Blears as the person to "cleanse" Labour is pretty daft BTW. The most likely candidate for that role might be John Cruddas, but does he stand a chance anyway?