If I was a politician sat in the House of Commons and I was already on the bring of defecting and my party said something to finally tip me over the edge, I think I would walk out, not attempt to walk across to the other party. What if nobody wants me
As for my politics, I've been Labour since October and nobody has really made a massive deal on it on here but since I started posting more regularly again it seems to be the topic of the conversation the moment a thread goes a bit quiet!
I was a Conservative voter all last year at University and anyone who knows Lancaster's college system will know I am in the socialist college and took a full year of abuse for being 'the tory'. In fact I still take that in the Labour Club

there is also 'the lib dem' (though I'd like to add he is slightly worse because he left lib dems a few days before the lib dem club fell apart). I was independent of all political groups at university last year and drank in the bars with both sides of the line. It didn't particularly bother me.
Even now my views haven't particularly changed. None of the parties match my views perfectly so it doesn't particularly matter which I'm in really but if I am going to work for the uni and promote opportunities for all then my politics should ideally represent that as best as possible.
The Labour Club at uni is old Labour so I'm currently alienated by them along with two other members but I still drink in my bar as usual. It has always had written above the bar on the chalkboards that tories aren't welcome to sit at the bar and I always have done in the same seat!
I will do exactly as someone said though when it comes to the general election and vote for who is the best, maybe not just at that particular time, but most consistently. Sadly the Labour Club at University makes me reluctant to show any loyalty to the party but I think too much loyalty in politics is quite damaging anyway.