Governor Brian Schweitzer vowed on Tuesday to cling to Exxon Mobil like "the smell on a skunk" for as long as it takes to get the company to clean up a weekend oil spill that fouled an otherwise pristine stretch of the Yellowstone River in Montana.

A 12-inch Exxon pipeline ruptured on Friday night about 150 miles downstream from Yellowstone National Park near the town of Laurel, Montana, southw