Mark Blumenthal gives hope to GOP candidates polling in the single digits:
The Republican presidential campaign of 2012 will probably have more in common with Democratic contests in 2004, 1992, 1988 and 1976 — all of which lacked strong, early frontrunners. Some of those races finished with victories by candidates whose national polling started in the low-single digits, including Presidents Jimmy Carter (3.5 percent on the Gallup poll in February 1975) and Bill Clinton (3.0 percent in February 1991) and 1972 Democratic nominee George McGovern (6 percent in August 1971). In 2004, John Kerry started stronger, but fell to just 7 percent in December 2003. All four turned successes in early caucus and primary states into broader recognition and support that enabled their nominations.