Connecticut primary - LIVE: Polls wind to a close as voters seek candidates for wide-open governor election

The biggest race as Connecticut residents goes to the polls for Tuesday's primaries is for the governor's office.

There is an open seat, with Democrat Governor Dannel Malloy not seeking re-election; Republicans believe they have a good chance of winning it back after losing control in 2010. Control of the narrowly divided General Assembly is also in play, especially the state Senate, now equally split between Democrats and Republicans.

Democrats would have a lot of advantages in the state, with more registered Democrats than Republicans, and the fact that the entire Congressional delegation is currently Democrat. But Mr Malloy had grown deeply unpopular, offering Republicans a chance.

For the Democrats, businessman Ned Lamont is up against Bridgeport Mayor Joe Ganim. Mr Ganim previously served as Bridgeport mayor for more than a decade and was able to win re-election to the role in 2015 following a seven-year stint in federal prison for political corruption.

For the GOP, it is David Stemerman, Danbury Mayor Mark Boughton, the party's endorsed candidate; Tim Herbst; Madison businessman Bob Stefanowski; and Westport tech entrepreneur and former US Navy officer Steve Obsitnik.

In Congress, Republicans will choose between business owner Matthew Corey and Dominic Rapini as their candidate to challenge Democratic Senator Chris Murphy.

In western Connecticut's 5th congressional district, where Democrat Representative Elizabeth Esty is not seeking re-election to the House, Mary Glassman and Wolcott teacher Jahana Hayes are vying for the Democratic nomination. Former Meriden Mayor Manny Santos, retired university professor Ruby O'Neill of Southbury and Watertown manufacturing consultant Rich Dupont are seeking the Republican nomination.

Tuesday also also sees primaries in Minnesota, Wisconsin and Vermont.

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Associated Press contributed to this report.