"The bump is eclipsing my husband," says pregnant Samantha Cameron as she makes election trail debut

Samantha Cameron made her election trail debut this week, accompanying her husband David Cameron on a visit to an inner city youth club.

But the clear star of the video – which can be seen on the Conservative Party website – is clear: Samantha's burgeoning tummy.

Asked if he has been giving his wife any tips on campaigning, Mr Cameron says: "She doesn't need any tips, she's eclipsing me completely."

Samantha, expecting her fourth child in July, says: "I think the bump is."

'Web Sam Cameron' is the first in a series of planned films leading up to the general election, which Gordon Brown has called for May 6.