CBS News Battleground Tracker: In Iowa, it's Sanders, Biden and a wild finish ahead

It's a tight and fluid race heading into the final week in Iowa for a lot of reasons. Bernie Sanders is attracting 26% support, with Joe Biden at 25%, as the top preferences of likely caucus goers. Pete Buttigieg is right there within striking distance at 22%. Elizabeth Warren has 15% support and Amy Klobuchar has 7%, but because of the way caucuses work, these are critical numbers with implications for the race.

Iowa

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