Chris Bertram says he's voting for Labour:
[H]ere’s the decisive thing for me. We all know that the next few years in the UK are going to be tough and that the volume of cuts that each party would make are about the same. Where there is a difference is in the distribution of the pain. If the Tories are in power it will fall on the very poorest and most vulnerable. The Lib Dems will be better than that, but they too will appease their middle-class base. A Labour government will still hurt the most vulnerable but less so. Labour aren’t going to win, but it would be very very bad if they came third. Their base, again, composed disproportionately of the worst-off, would become still more marginalized. So share of the vote counts too, even in a first-past-the-post system. I’m voting Labour.