Georgia runoff too close to call; Bennet gets big win in Colorado

Steve Brusk and Kevin Bohn
CNN

McMahon, Malloy, Foley win in Connecticut

An incumbent U.S. senator with help from the White House held off a tough primary challenge in Colorado, a former wrestling executive easily won the Republican nomination for the Senate in Connecticut, and a dramatic runoff for the Republican governor's nomination in Georgia was too close to call on a busy primary night Tuesday.

Four states went to the polls with high-profile primaries for governors and the U.S. Senate. Three of the races for governor kept candidates and supporters biting their nails into the early morning hours.

In Colorado, incumbent U.S. Sen. Michael Bennet claimed victory in the Democratic primary after staving off a fierce challenge from former Colorado House Speaker Andrew Romanoff. Bennet will face Weld County District Attorney Ken Buck, who - with the support of many Tea Party backers - defeated former Lt. Gov. Jane Norton for the GOP nomination.

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