As you can see from the answers below, do not go this direction or believe what you read in a "how to get rich book" it may work on tax lien properties in "who the heck know's town" but it does not happen here.
Please feel free to call and arrange a time to get educated on the foreclosure market as it happens here in SF and CA.
Fillmore, before you give up, find out what the home is worth and what is owed. As the others have pointed out, they are probably upside down, (owing more than it's worth), but sometimes, and it's rare, the owner may have gotten behind and still could have equity.
If the home is in foreclosure, the note is now due in full and you wouldn't be able to 'take over' the loan. As Ron points out if the homeowners are in default they also owe more on the home than it's worth.
Most of the 'take over payments' advocates make their money not from real estate but from selling worthless information to unsuspecting prospective investors. There is no free lunch.