United would have moved a point clear of Chelsea with victory but are one point behind having played a game more.
Clermont Auvergne's bonus-point victory over the Scarlets relegated Wasps to third place in the group.
The hosts led by 0-7 to 0-4 at half-time and extended their advantage to secure a four-point victory.
Irish topped Pool One thanks to their bonus-point victory which also secures them a home tie in the next round.
Mehrtens came on as an early replacement and kicked 12 points as the Crusaders started their season with a bonus-point victory.
Replacement Wilkinson reduced the deficit with a well struck drop goal but O'Driscoll secured the bonus point victory with his 58th-minute try, O'Gara converting.
After the break, Farrell kicked two more penalties for a six-point victory.
He routed his main rival Rick Santorum in Maryland, winning nearly 50% of the vote, and appeared set for a five-point victory in Wisconsin.
And it was young Ospreys number ten Biggar, on his home turf, that clinched a potentially vital bonus point victory with a late score.
They trailed by 16 before rallying for a six-point victory over a Knicks team that had beaten them badly twice earlier in the season.
People in some circles, though, considered the 17-point victory a loss.
But Hefin O'Hare and Bernardo Stortoni tries secured a bonus-point victory.
Edinburgh needed a bonus point victory away to long-time leaders Leinster, but they had a 28-20 lead turned into a 37-28 defeat in the closing stages.
It was not enough to overhaul Perpignan as the French side went through as group winners after they also sealed a bonus-point victory, 37-5 against the Scarlets.
Blues travelled on the back of an encouraging bonus-point victory over Edinburgh last weekend, and gave competitive debuts to prop Tom Davies and New Zealand flanker Michael Paterson.
The Huskies have run through their four opponents so far, winning by an average of 39 points, including a 30-point victory over Kentucky in the regional final on Monday night.
Although they achieved what was expected in terms of the victory and bonus point, Brian McLaughlin's men will know they will have to perform better away to Biarritz next weekend.
Champions Leicester had began the day in sixth, needing a bonus-point victory over the Quins, as well as Sale losing to London Irish to qualify for the final play-off spot.
Nevertheless, the president remained victorious because of an increase in support among black voters, who increased their share of the electorate from 11% to 15%, resulting in a 2-point victory (50.1% to 48.2%).
The Knicks followed that formula Monday during their 22-point comeback victory over the Cleveland Cavaliers.
But Gloucester, with three penalties from Ryan Lamb, had the victory and the bonus point in the bag.
Robinson duly stepped up to give Gloucester victory by a single point.
The victory lifted them one point clear of AC Milan, who had briefly gone top with a 1-0 win at Chievo Tuesday.
CNN: Dortmund sink Bayern in Bundesliga top of the table clash
Cueto then ensured Sale capped a famous victory with a bonus point as he dived over for their fourth try a minute later.
He also has other advantages: a 20-point election victory, Democratic majorities in both houses of the legislature, and an electorate that is in a thoroughly pragmatic mood.
If the precise moment of inception is vague the point of victory of the lounge suit over its forerunners as the standard battledress of the office worker is clearer.
But victory and the bonus point was secure for Leinster when Cian Healy's drive into the Racing 22 was finished off by Heaslip running in his team's fourth try.
England rediscovered the faith that had deserted them during the half-time interval against Sweden - and a famous and wonderfully well-deserved victory was on the point of being won.
Brooklyn had a better performance coming off its 17-point home victory over Washington on Friday in which Williams set the NBA record with nine 3-pointers in a half and scored a season-high 42 points.
Second-placed Werder Bremen can cut the gap on Jupp Heynckes' unbeaten side to one point with victory at Cologne on Sunday, having been joined on 27 points by Bayern Munich -- who defeated Borussia Moenchengladbach 2-1 on Friday night.
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