National Journal has this story, detailing Indiana election laws and how they would operate if U.S. Senator Richard Lugar were to run for re-election next year as an independent or as the Libertarian Party nominee. As the story explains, Lugar has not said he has any intent to do either of those things. But some polls have suggested that Lugar will have trouble winning the 2012 Republican primary.
Lugar will be 79 years old in a few weeks, and he has been in the Senate since 1976. No independent candidate for either Governor or U.S. Senator has ever appeared on a government-printed Indiana ballot. Indiana has a tradition of disinterest in independent candidates. No independent has been elected to the Indiana legislature since 1880. Indiana has a straight-ticket device, which injures independent candidates.