Political pollster Gallup looked at the effect of union membership on probable presidential election voting in a recent poll, finding that the majority of union members say that they would vote for President Barack Obama over Republican nominee Mitt Romney. Of union members, which made up about 12 percent of the registered voters polled, 58 percent indicated that they would vote for Obama, while 35 percent favored Romney. This is a significant difference from non-union members, who favored Romney over Obama, 48 percent to 44 percent.Union members have traditionally favored Democrats more than their non-union counterparts, so this data is not surprising. But with the presidential race projected to be close, it will be interesting to see how the support of union workers and the willingness of unions to spend significant money in support of President Obama’s reelection bid affects the President’s policy decisions as the election nears. See the full Gallup poll analysis here.