From the AP:

Perhaps no region of the country better illustrates Barack Obama’s political vulnerabilities than the mountain West, a region traditionally wary of the federal government.
He’s hoping to ease some of those concerns in a Western swing blending town hall appearances and visits to national parks beginning Friday.
Tracking polls by Gallup from January through June show that of the 10 states where Obama’s approval rating was the lowest, five are in the mountain West. They include the two states Obama is visiting this weekend as well as Wyoming, Idaho and Utah.