Peter Hamby and Steve Brusk
[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/POLITICS/08/24/tuesday.primaries/story.voters.jpg caption="Voters go to the polls Tuesday in Florida, Alaska, Oklahoma, Vermont and Arizona." width=300 height=169]
(CNN) - As voters in five states go to the polls on Tuesday, big-dollar challenges to veteran politicians dominate the top races.
The big storylines: Two billionaire political newcomers spent millions of their own money to try to pull upsets in Florida, Arizona Sen. John McCain is expected to fend off the biggest Republican primary challenge of his Senate career and a little-known Tea Party candidate is taking on an incumbent senator in Alaska.
Voters will also pick the Democratic gubernatorial nominee in a wide-open Vermont race, and decide the runoff winners in two Oklahoma Republican primaries.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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