CHARLOTTE, N.C.—A week after polls showed Democrats in danger of losing a Connecticut U.S. Senate seat, the message went out quickly at the national party convention: Help Chris Murphy.

Connecticut Democrats focused on Murphy as his race against Republican Linda McMahon for the state’s open U.S. Senate seat becomes increasingly tight. With just two months to go before the general election, the race is neck-and-neck, according to two polls released last week. The two parties are fighting this year for control of the U.S. Senate, with the outcome uncertain. McMahon has gained considerably on Murphy in recent weeks amid a barrage of TV ads targeted largely at women; alarm bells have gone off nationally among Democrats as a result.

The Murphy Save Our Ship message emerged before the convention even officially began Monday, then continued Tuesday morning over hash browns and scrambled eggs at a campaign brunch.

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