Tom Harken on McCain Visit

The McCain administration visited Iowa, home of Senator Tom Harken (D). Senator Harken was outraged when McCain and Palin chose to talk about the economy. Iowa's biofuel production is the fastest growing sector in the state and revitalizing rural communities. McCain missed an important topic to the state of Iowa, and could prove to be an issue later in the election. When you read the article, you have to imagine if Harken would have said this if he was a Republican, or rather if Obama was there talking about the same topics. Does the fact that he's a Democrat override some of the statements? Is there some bias in this? I say so, and think there is too many biased remarks in politics. Was it this wrong of McCain to talk about our struggling economy instead of Iowa's biofuels? Although it was a small mistake by McCain, did Senator Harken make it bigger than it should have been?