I've got an appauling record:

2005 gen election, voted Lib Dem as iraq protest. Got the candidate in, but immediately regretted it as he replaced a good Labour guy. - WIN (I guess)

2008 London Mayor: Boris won, obvs didn't vote for him. - LOSE

2009? Euro election, voted Labour, who won in London but came 4th in the UK - LOSE

2010, Labour again, and again the candidate won but the party didn't - LOSE

2011? AV referendum. - LOSE

2014 Euro Election. Voted Green, due to having more faith in the candidate than I've had in any other candidtate before or since. She got in but UKIP topped the UK poll - LOSE

2015 General election. Local success, national disaster. - LOSE

2016 EU referendum. - LOSE

Not a sucessful 11 years of influence I have to admit