Obesity and high blood pressure is a bad combination:

If you are overweight, new research shows how important it is to control your blood pressure besides trying to lose those extra pounds. Scientists studying nearly 250,000 people in France found that only overweight people who also had high blood pressure were at significantly greater risk of dying of heart-related problems than normal-weight people. Overweight people with normal blood pressure faced no increased risk.

This doesn't mean that extra pounds aren't dangerous, because overweight people are more likely to develop blood pressure problems.