It was almost impossible to find a loser on the Dow (DJINDICES:^DJI) yesterday. Today tells almost the opposite story.

While Monday's markets were lifted by positive American manufacturing statistics, the Spanish economy is keeping a lid on today's action. The Dow is down 0.5%, with only five of 30 stocks trading in the black, and the worst performers make their hay in the infrastructure sector.

Chemicals giant E.I. Du Pont de Nemours (NYSE:DD) dropped 1.4%, and construction machinery expert Caterpillar (NYSE:CAT) is down 1%. Together, these two stocks took 11 points off the index. In both cases, investors worry that European orders may suffer if Spain swallows its national pride and asks for a bailout.

Brand-new Dow member UnitedHealth Group (NYSE:UNH) put its best foot forward in its index debut, gaining 0.1% at midday. That move pushed the Dow northward by a single point -- one of the biggest gains of the day.

The biggest winner? Technology conglomerate 3M (NYSE:MMM), which jumped 0.3% for three entire Dow points. Investors like the Post-It Notes maker's acquisition of ceramics maker Ceradyne, and media personality Jim Cramer just threw his support behind the stock on TV

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Fool contributor Anders Bylund holds no position in any of the companies mentioned. Check out Anders' holdings and bio, or follow him on Twitter and Google+. The Motley Fool owns shares of Ceradyne. Motley Fool newsletter services have recommended buying shares of 3M and UnitedHealth Group. Motley Fool newsletter services have recommended creating a diagonal call position in 3M. Motley Fool newsletter services have recommended creating a diagonal call position in UnitedHealth Group. The Motley Fool has a disclosure policy.

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