By Moira Warburton WASHINGTON (Reuters) – Control of the U.S. House of Representatives is at stake in the Nov. 8 midterm elections, with Republicans favored by nonpartisan forecasters to win a majority in the chamber, which would allow them to block President Joe Biden’s legislative agenda and launch investigations of his administration. Here are nine races that could determine which party wins control of the chamber: ALASKA’S AT-LARGE DISTRICT Democrat Mary Peltola won a surprise victory in an August special election, beating two Republicans: former Republican vice presidential nominee Sarah …