By the shape of it's body, looks like it may be a common ground beetle. They pretty much stay on the ground as the name suggests and only climb a bit for dinner. Does it have a ridge on it's back? It could have a slightly iridescent sheen to it's shell too, tho doesn't have to. They're great to have in the garden, nosh on slugs & aphids they do. I think they come into homes for shelter and also are attracted to light, so a porch light may attract them?
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