Crossing State Lines

I forgot to post this after the 2nd US Presidential debate:

John McCain talks about health care:

I want to give every American a $5,000 refundable tax credit. They can take it anywhere, across state lines. Why not? Don't we go across state lines when we purchase other things in America?

My question is, when he says I can cross state lines, does that mean I can go to Canada?

No seriously.