Mystery Plant or Mystery Weed, Which Is It?

Maybe you can help us figure something out. Jaime sent me this picture of a plant growing where she wanted to plant zinnias. If the plant growing there is something good then she'd like to see it grow to flower but if it's a weed well, you know what she'll do to that weed! I've checked out several weed pictures and can't seem to match one up with the plant in her picture so I figured that someone reading this blog might have a good guess that will help Jaime out.  Here's the picture of the mystery plant:

What do you think? What plant is this mystery plant?