At least, a little one.
Scientists are still poring over data gathered from the Phoenix Mars Lander, but think they’ve found evidence that water vapor is collapsing into the Martian soil at night. The thin films of “unfrozen water” (not as free-flowing as water but more mobile than ice) are enough to allow some chemistry and might even support some biology.
The article doesn’t extend a lot of hope that conditions are sufficient to support life currently, but this helps bolster the argument that conditions might have been favorable in the fairly recent past.