Is a residential home purchase contract be valid if only one spouse signs as buyer, although both buyers' names are on the contract?

In order for a real estate contract to be valid, the contract must be signed and delivered to the other side.  If the terms of the contract require two spouses to sign and only one signs, then it doesn't appear to be accepted.  What may be more important is what names are on the deed.  If both spouses own the property and only one agrees to sell, then the spouse can't convey good title.  The spouse who didn't sign can't be forced to sell.