Hundreds of hours on the road, dozens of media appearances and the polls are neck and neck.

Politicians have spent 30 days on the election trail but it's hard to say who's having the most successful campaign.

It's clear who is having the worst time of it though: the Lib Dem battle bus.

All the parties are touring the country in coaches, their seats stuffed with journalists, politicians, spin doctors and aides.

Yet the yellow Liberal mammoth, despite its luxurious seats, disco lights and televisions, has had the hardest time of it.

It began by making headlines as it struggled to turn left in Oxfordshire.

Needless to say, those who didn't support the Lib Dems tweeted, saying it was "lurching to the right".

First blood was drawn in Poole, where it hit a pigeon.

Then there were some technical issues, with the bus breaking down first in Crouch End and then in Brixton.

No wonder it was full of beer.

Yet it continued to vex reporters.

Now it's stuck on a hill.

Of course it hasn't all been easy riding for the other parties' buses either.

Labour's pink bus wasn't all that popular at the start.

The Green Party's bus runs on chip fat, so environmentally friendly, but we are yet to see how it fares on the roads.

UKIP's common sense bus doesn't look entirely safe either, with a dent, a flattish tyre and a missing hub cap.

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