The approach of November’s mid-term elections, in which Democrats are fighting to wrest at least partial control of the federal government from Republicans, fueled ad sales at Charter Communications in the three months through June.

Net income at the Stamford, Conn.-based telecommunications firm rose 96 percent to $273 million, supported by a 12 percent increase in advertising revenue. Total sales grew 4.8 percent to $10.9 billion in the quarter.

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