Midfielder Ricky Ravenhill struck the only goal of the game at Huish Park with a great volley 18 minutes from time.
Hull kept up the pressure on their Yorkshire rivals with their 3-0 win.
Northern Irish star Stuart Elliot opened the scoring after 20 minutes following good work from Jonathan Walters.
The Tigers sealed their victory late on when Ben Burgess (pictured, 78) and Ryan France (90) both headed home from close range.
Third place Huddersfield Town slipped up at home to lowly Rochdale as they drew 1-1 The McAlpine Stadium.
Dale actually took the lead through Leo Bertos just before the interval, but Anthony Lloyd soon levelled after the break.
Torquay United missed the chance to move to within one point of Huddersfield, as they let a 2-0 lead slip at The Memorial Stadium against Bristol Rovers.
Jo Kuffour (5 & 17) pounced twice early on, but The Pirates hit back through Paul Tait (28) and Sonny Parker (52) to seal a share of the spoils.
Mansfield Town's play-off hopes suffered a blow with a 3-0 defeat at Bury.
A brace from Gareth Seddon (26 & 60) and a penalty from Danny Swailes (43) gave The Shakers victory.
Lincoln City denied Southend United victory with two second half strikes.
Leon Constantine (30 & 36) put The Shrimpers 2-0 at half time, but they could not hold out as Francis Green (51) and Simon Yeo (90) pounced.
Boston United moved away from the bottom two with a 1-0 win at Cambridge United.
Stuart Balmer claimed the only goal of the game after five minutes.
Kidderminster Harriers won the battle of the mid-table teams at Glanford Park with a 2-0 win over Scunthorpe United.
Ian Foster opened the scoring after 18 minutes, before Dean Keates made it 2-0 just after half time (54).
The Iron's poor night was compounded when Kevin Sharp was dismissed.
Macclesfield Town and Carlisle United remain in the relegation places, but The Moss Rose outfit bolstered their survival hopes with a 2-1 win over Swansea.
Matthew Tipton put The Silkmen ahead after eight minutes and then on the hour Shaun Byrne was sent off for Swansea.
Macclesfield extended their advantage against the ten men when Paul Harsley pounced (68).
Brad Maylett pulled one back for the Welshmen, but it was too little too late to deny Macclesfield who are now just three points off third from bottom Rochdale.
Carlisle United remain seven points adrift after they were held to a 1-1 draw by Northampton at Brunton Park.
The Cumbrians took the lead with just eight minutes remaining when Craig Farrell pounced - but just 60 seconds later Welsh international Paul Trollope levelled for The Cobblers to maintain their play-off hopes.
Click below for match summaries:
Bristol Rovers 2-2 Torquay United
Bury 3-0 Mansfield Town
Cambridge United 0-1 Boston United
Carlisle United 1-1 Northampton Town
Huddersfield Town 1-1 Rochdale
Hull City 3-0 Leyton Orient
Lincoln City 2-2 Southend United
Macclesfield Town 2-1 Swansea City
Scunthorpe United 0-2 Kidderminster Harriers
Yeovil Town 0-1 Doncaster Rovers
