You really should consider becoming a politician!
Hopeless wrong with your last sentence I'm afraid. I have voted Liberal (before they became Liberal Democrats) back in my Essex days, Plaid Cymru (a protest vote), Labour (Paul Murphy, Pontypool) and Conservative (Stephen Crabb, Pembs). In each case my decision was based on my assessment of the integrity of the candidate (as far as possible) and his/her record on local issues and voting patterns in Parliament (where applicable). Of course no individual M.P. has ever been in complete alignment with my own views which is inevitable in a democracy.