There is a spider living on my porch, is it poisonous?

It's black and has a rather large abdomen and kind of short and skinny legs. It also has a red dot on it's butt.

Answers:
Could it be a Black Widow?
Black widows are poisonous. They will bite if provoked. The bite feels like a sharp pain ,like a needle puncture. After 15 minutes to an hour there will be muscular cramps. Bites are rarely fatal, but you should seek medical attention.
Does it look like that? Does anyone know hot to dry sunflowers?
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