Re voting Labour or Lib Dem - if you live in a marginal, and are opposed to the Tories, surely you vote for the party that stands the best chance of defeating the Tories in that seat ?
Something the Tories are good at is assimilating other parties so as not to split their vote (UKIP).
If you're opposed to the Tories you've got Labour, Lib Dem, SNP, Plaid, Greens (and yes, UKIP) to split the vote. In a FPTP system I can't see anyone challenging the Tories for a long time unless progressive alliances are made. This is even without the boundary changes that are supposed to favour the Tories that will come into place for the election after this.
Re voting Labour or Lib Dem - if you live in a marginal, and are opposed to the Tories, surely you vote for the party that stands the best chance of defeating the Tories in that seat ?
Something the Tories are good at is assimilating other parties so as not to split their vote (UKIP).
If you're opposed to the Tories you've got Labour, Lib Dem, SNP, Plaid, Greens (and yes, UKIP) to split the vote. In a FPTP system I can't see anyone challenging the Tories for a long time unless progressive alliances are made. This is even without the boundary changes that are supposed to favour the Tories that will come into place for the election after this.