The Opposition leader is travelling to the Hampshire town where the Lib Dems are engaged in a fierce battle to prevent their Tory coalition partners snatching the seat.
Labour is hoping for a good showing in the contest sparked by the resignation in disgrace of ex-cabinet minister Chris Huhne after he admitted dodging a speeding penalty.
But despite recruiting best-selling author and satirist John O'Farrell as its candidate, insiders acknowledge it has no realistic chance of winning on February 28.
Mr Miliband will use his visit in a bid to capitalise on his surprise announcement yesterday that Labour favoured reviving the 10p income tax rate.
More top news
The NSPCC has revealed that it dealt with nearly 19,500 calls and emails from concerned adults in the last year relating to child neglect.
Donald Trump has hit out at the media over its coverage of his reaction to the violence in Charlottesville at a campaign rally in Arizona.
Nearly 500 identity frauds were reported every day in the first half of this year.