John McCain has a new ad airing in Iowa, featuring the candidate speaking to the camera and pitching his health care plan to voters in a key swing state -- an indication that McCain is looking to shore up his standing on domestic issues:

Iowa voted narrowly for Al Gore in 2000, then narrowly for President Bush in 2004, and polls this year have mostly shown McCain trailing Barack Obama and beating Hillary Clinton here. So no matter who the Democratic nominee ends up being, expect this state to be very closely contested.