I know that commas are necessary in this situation:

"John Kerry, a Republican candidate, made a speech today."

However, they don't seem necessary here:

"The kid, who owns toy cars, is nice."

Am I wrong about this? I just want to make sure.

Thanks for your time.

I know that commas are necessary in this situation:

"John Kerry, a Democratic candidate, made a speech today."

However, they don't seem necessary here:

"The kid, who owns toy cars, is nice."

Am I wrong about this? I just want to make sure.

Thanks for your time.