For the first time in its history, independents will be allowed to vote in the primary. But you have to ASK for the ballot of the party you want to vote in.
And the primary is open, meaning that independents are allowed to vote in the Democratic primary. Independents have tended to support Obama in previous primaries. (CNN)
Brian Howey: Our polling is showing that the Indiana primary may be decided by Republican and independent voters. Up to 20 percent may be non-Democrats. (Washington Post)
The primary is open to Republicans and independents, which could help explain why only 44 percent of likely voters said they would vote Democratic if their favored candidate doesn't secure the nomination; 38 percent said they would support the presumptive Republican nominee, John McCain, in November. (Boston Globe)
Indeed, a poll Howey's newsletter released last week showed that Democrats who planned to vote were split 46%-46% between Clinton and Obama, with Clinton having a slight edge (50% to 44%) among Republicans who said they planned to vote in the contest and Obama holding a wider edge (54% to 38%) among independents. (Milwaukee Journal Sentinel)