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An alliance of Republican groups is launching a $50 million advertising blitz this week in a final push to help the GOP win a majority in the House, representing the biggest spending blitz ever by such groups in a congressional election campaign.

The coordinated effort, which the groups have dubbed the “House surge strategy,” tops what the official Republican House election committee expects to spend on television ads for the entire contest. It is aimed at the few dozen competitive races where Democratic candidates have significantly more money in the bank than their Republican opponents, eating into one of the Democrats’ last financial advantages.