They found that men with diabetes or three or more CV risk factors who were randomly allocated to consume 272mL of traditional red wine each day in addition to their normal diet for 4 weeks experienced a small reduction in systolic and diastolic BP (2.3 and 1.0 mmHg reductions, respectively).
http://www.news-medical.net/news/20120913/Alcohol-douses-the-blood-pressure-benefit-of-red-wine.aspx
http://www.news-medical.net/news/20120913/Alcohol-douses-the-blood-pressure-benefit-of-red-wine.aspx