A useful list of forces that impede good decision-making from Farnham Street. They seem equally applicable to lobbying and campaigning.
What others would you add? Here are some more from my side:
Lateness
Political blindness
Denial of political reality – the votes are not saying what we want them to say
Stasis
$
$ will make this go away
A PR focus
Lack of relationship with political decision-makers and influencers
Lack of a solution
Lack of trust