Here is an interesting video, uploaded to the parliament Youtube channel and and attempt to answer and so alter negative perceptions of politicians and in the case of this video those sitting in the House of Lords.
While including elected members may have strenghtened the case, but well made and designed to be persuasive; it puts the uninformed but negative position first and then unravels it slowly before putting a case for 'why politics matters'. It does seem to jump about a bit but a reasonable attempt. Whether it has any impact will depend on if the disengaged are among the 2,360 viewers since may 8th. However this is unlikely, those who believe politics is irrelevant and politicians are self-seeking are hardly likely to dip into the parliament site on Youtube: the web can be used to communicate with young voters but you got to have something to attract them to your site.